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A firearm is any type of
gun A gun is a designed to use a shooting tube () to launch typically solid s, but can also project pressurized (e.g. s/s, s for or , , and technically also s), (e.g. ) or even s (e.g. ). Solid projectiles may be free-flying (as with and s ...

gun
designed to be readily carried and used by an individual. The term is legally defined further in different countries (see
Legal definitions Law is a system of rules created and law enforcement, enforced through social or governmental institutions to regulate behavior,Robertson, ''Crimes against humanity'', 90. with its precise definition a matter of longstanding debate. It has bee ...
). The first firearms originated in 10th-century
China China (), officially the People's Republic of China (PRC; ), is a country in . It is the world's , with a of more than 1.4 billion. China spans five geographical and 14 different countries, the in the world after . Covering an area of ap ...
, when
bamboo Bamboos are a diverse group of evergreen perennial plant, perennial flowering plants in the subfamily (biology), subfamily Bambusoideae of the grass family ''Poaceae''. The origin of the word "bamboo" is uncertain, but it probably comes from t ...

bamboo
tubes containing
gunpowder Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produces lower amounts of smoke when fired, unlike black powder. The ter ...
and
pellet Pellets are small particles typically created by compressing an original material. Pellet or pellets may refer to: People * Alain Pellet (born 1947), French lawyer * Gustave Pellet (1859–1919), French publisher of art * Laurent Pellet (born 1970 ...
projectiles were mounted on spears to make the portable
fire lance Fire is the rapid oxidation of a material (the fuel) in the exothermic chemical process of combustion, releasing heat, light, and various reaction Product (chemistry), products. Fire is hot because the conversion of the weak double bond in m ...

fire lance
, operable by a single person, which was later used to good effect in the
Siege of De'an The siege of De'an (德安之戰) was fought as part of the Jin-Song Wars of China in 1132, during the Jin invasion of Hubei Hubei (; Postal romanization, alternately Hupeh) is a landlocked provinces of China, province of the China, People' ...
in 1132. In the 13th century, fire lance barrels were replaced with metal tubes and transformed into the metal-barreled
hand cannon The hand cannon (Chinese Chinese can refer to: * Something related to China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the List of countries and dependencies by population, world's most popu ...

hand cannon
. The technology gradually spread throughout
Eurasia Eurasia () is the largest continent A continent is any of several large landmasses. Generally identified by convention (norm), convention rather than any strict criteria, up to seven geographical regions are commonly regarded as cont ...

Eurasia
during the 14th century. Older firearms typically used
black powder Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder file:N110 ruuti.jpg, Finnish smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produces less smoke and les ...
as a
propellant A propellant (or propellent) is a that is expelled or expanded in such a way as to create a or other in accordance with , and "propel" a vehicle, , or payload. In vehicles, the engine that expels the propellant is called a . Although technical ...
, but modern firearms use
smokeless powder Finnish smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produces less smoke and less fouling when fired compared to gunpowder ("black powder"). The combustion products are mainly gaseous, compared to ...
or other propellants. Most modern firearms (with the notable exception of
smoothbore A smoothbore weapon is one that has a without . Smoothbores range from handheld to powerful s and large artillery s. History Early firearms had smoothly bored barrels that fired s without significant spin. To minimize inaccuracy-inducing ...
shotgun A shotgun (also known as a scattergun, or historically as a fowling piece) is a long-barreled firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid pr ...

shotgun
s) have
rifled tank gun. In firearms, rifling is machining Helix, helical grooves into the internal (bore) surface of a gun's Gun barrel, barrel for the purpose of exerting torque and thus imparting a Rotation, spin to a projectile around its longitudinal axi ...
barrels to impart spin to the
projectile A projectile is a missile propelled by the exertion of a which is allowed to move free under the influence of and . Although any objects in motion through space are projectiles, they are commonly found in and s (for example, a thrown , kicked ...

projectile
for improved flight stability. Modern firearms can be described by their
caliber A 45 ACP hollowpoint (Federal Cartridge, Federal HST) with two .22 Long Rifle, 22 LR cartridges for comparison In gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but ...

caliber
(i.e. bore diameter). For pistols and rifles this is given in millimeters or inches (e.g. 7.62mm or .308 in.), or in the case of shotguns by their
gauge Gauge (US: , UK: or ) may refer to: Measurement * Gauge (instrument) A gauge, in science Science (from the Latin word ''scientia'', meaning "knowledge") is a systematic enterprise that Scientific method, builds and Taxonomy (general), o ...
(e.g. 12 ga. and 20 ga.). They are also described by the type of action employed (e.g.
muzzleloader A muzzleloader is any firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. water guns/ cannons ...

muzzleloader
,
breechloader A breechloader is a firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. water guns/ cannons ...
,
lever A lever ( or ) is a simple machine consisting of a beam or rigid rod pivoted at a fixed hinge Image:Hamburgerpaumelle.JPG, A barrel hinge A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle o ...
,
bolt Bolt or bolts may refer to: Implements and technology * Bolt (fastener) A bolt is a form of threaded fastener with an external male thread requiring a matching pre-formed female thread such as a nut. Bolts are very closely related to screw ...
,
pump A pump is a device that moves fluids (s or es), or sometimes , by mechanical action, typically converted from electrical energy into hydraulic energy. Pumps can be classified into three major groups according to the method they use to move the fl ...
,
revolver .357 Magnum The .357 Smith & Wesson Magnum, .357 S&W Magnum, .357 Magnum, or 9×33mmR as it is known in unofficial metric designation, is a smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produc ...

revolver
, semi-automatic,
fully automatic An automatic firearm is a firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further in different countries (see Legal definitions). The first firearms originated in 1 ...
, etc.), together with the usual means of deportment (i.e. hand-held or mechanical mounting). Further classification may make reference to the type of
barrel A barrel or cask is a hollow cylindrical A cylinder (from Greek Greek may refer to: Greece Anything of, from, or related to Greece Greece ( el, Ελλάδα, , ), officially the Hellenic Republic, is a country located in Southeast Eu ...
used (i.e.
rifled tank gun. In firearms, rifling is machining Helix, helical grooves into the internal (bore) surface of a gun's Gun barrel, barrel for the purpose of exerting torque and thus imparting a Rotation, spin to a projectile around its longitudinal axi ...
) and to the barrel length (e.g. 24 inches), to the firing mechanism (e.g.
matchlock with serpentine lock The matchlock was the first mechanism invented to facilitate the firing of a hand-held firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further i ...
,
wheellock , c. 1580 A wheellock, wheel-lock or wheel lock is a friction-wheel mechanism which creates a spark that causes a firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined furth ...
,
flintlock Flintlock is a general term for any firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. ...

flintlock
, or
percussion lock The percussion cap or percussion primer, introduced in the early 1820s, is a type of single-use percussion ignition device for muzzle loader firearm locks enabling them to fire reliably in any weather condition. This crucial invention gave rise ...
), to the design's primary intended use (e.g.
hunting Hunting is the practice of seeking, pursuing and capturing or killing wildlife or feral animals. The most common reasons for humans to hunt are to harvest useful animal products (meat, fur/hide (skin), hide, bone/tusks, horn (anatomy), horn/ant ...

hunting
rifle), or to the commonly accepted name for a particular variation (e.g.
Gatling gun The Gatling gun is a rapid-firing multiple-barrel firearm A multiple barrel firearm is any type of firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further in d ...

Gatling gun
). Shooters aim firearms at their targets with hand-eye coordination, using either
iron sights Iron sights are a system of physical alignment markers (usually made of lic material) used as a to assist the accurate aiming of s (such as a , , or even ), or less commonly as a primitive for s. The earliest sighting device, it relies complet ...
or optical sights. The accurate range of
pistol A pistol is a handgun, more specifically one with the chamber (firearms), chamber integral to its gun barrel, though in common usage the two terms are often used interchangeably. The English word was introduced in ca. 1570 – when early hand ...

pistol
s generally does not exceed , while most
rifle A rifle is a long-barrelled firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. water gun ...

rifle
s are accurate to using iron sights, or to longer ranges whilst using optical sights. (Firearm rounds may be dangerous or lethal well beyond their accurate range; the minimum distance for safety is much greater than the specified range for accuracy). Purpose-built
sniper rifle A sniper rifle is a high-precision, long range shooting, long-range rifle. Requirements include accuracy, reliability, mobility, concealment and optics for anti-personnel weapon, anti-personnel, anti-materiel rifle, anti-materiel and surveillanc ...

sniper rifle
s and
anti-materiel rifle An anti-materiel rifle (AMR) is a rifle A rifle is a long-barrelled firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also pr ...
s are accurate to ranges of more than .


Types

A firearm is a barreled
ranged weapon A ranged weapon is any weapon A weapon, arm or armament is any implement or device that can be used with the intent to inflict physical damage or harm. Weapons are used to increase the efficacy and efficiency of activities such as hunting ...
that inflicts damage on targets by launching one or more
projectile A projectile is a missile propelled by the exertion of a which is allowed to move free under the influence of and . Although any objects in motion through space are projectiles, they are commonly found in and s (for example, a thrown , kicked ...

projectile
s driven by rapidly expanding high-pressure gas produced by
exothermic In thermodynamics Thermodynamics is a branch of physics that deals with heat, Work (thermodynamics), work, and temperature, and their relation to energy, entropy, and the physical properties of matter and radiation. The behavior of these quan ...
combustion (
deflagration Deflagration (Lat: ''de + flagrare'', "to burn down") is subsonic Subsonic may refer to: Motion through a medium * Any speed lower than the speed of sound within a sound-propagating medium * Subsonic aircraft, a flying machine that flies at air ...
) of a chemical
propellant A propellant (or propellent) is a that is expelled or expanded in such a way as to create a or other in accordance with , and "propel" a vehicle, , or payload. In vehicles, the engine that expels the propellant is called a . Although technical ...
, historically
black powder Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder file:N110 ruuti.jpg, Finnish smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produces less smoke and les ...
, now
smokeless powder Finnish smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produces less smoke and less fouling when fired compared to gunpowder ("black powder"). The combustion products are mainly gaseous, compared to ...
. In the military, firearms are categorized into "heavy" and "light" weapons regarding their portability by
foot soldier at the Battle of the Somme The Battle of the Somme, also known as the Somme offensive, was a battle of the First World War fought by the armies of the British Empire and French Third Republic against the German Empire. It took place bet ...
s. Light firearms are those that can be readily carried by individual
infantry at the Battle of the Somme The Battle of the Somme, also known as the Somme offensive, was a battle of the First World War fought by the armies of the British Empire and French Third Republic against the German Empire. It took place bet ...

infantry
, though they might still require more than one individual ( crew-served) to achieve optimal operational capacity. Heavy firearms are those that are too large and heavy to be transported on foot, or too unstable against
recoil Recoil (often called knockback, kickback or simply kick) is the rearward thrust Thrust is a described quantitatively by . When a system expels or in one direction, the accelerated mass will cause a force of equal but opposite directi ...

recoil
and thus require the support of a
weapons platform A weapons platform is generally any structure A structure is an arrangement and organization of interrelated elements in a material object or system A system is a group of Interaction, interacting or interrelated elements that act according t ...
(e.g. a fixed mount, wheeled carriage,
vehicle A vehicle (from la, vehiculum) is a machine that transports people or cargo. Vehicles include wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses), railed vehicles (trains, trams), watercraft (ships, boats), amphibious vehicles ...

vehicle
,
aircraft An aircraft is a vehicle or machine that is able to fly Flies are insect Insects or Insecta (from Latin Latin (, or , ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Lat ...

aircraft
or
water vessel Watercraft, also known as water vessels or waterborne vessels, are vehicles A vehicle (from la, vehiculum) is a machine A machine is any physical system with ordered structural and functional properties. It may represent human-made or n ...
) to be tactically mobile or useful. The
subset In mathematics Mathematics (from Ancient Greek, Greek: ) includes the study of such topics as quantity (number theory), mathematical structure, structure (algebra), space (geometry), and calculus, change (mathematical analysis, analysis). ...

subset
of light firearms that only use
kinetic projectile A projectile is any object thrown by the exertion of a force. It can also be defined as an object launched into the space and allowed to move free under the influence of gravity and air resistance. Although any object in motion through space (for e ...
s and are compact enough to be operated to full capacity by a single infantryman (individual-served) are also referred to as "small arms". Such firearms include
handgun A handgun is a short-barrelled firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. water ...

handgun
s such as
revolver .357 Magnum The .357 Smith & Wesson Magnum, .357 S&W Magnum, .357 Magnum, or 9×33mmR as it is known in unofficial metric designation, is a smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produc ...

revolver
s,
pistol A pistol is a handgun, more specifically one with the chamber (firearms), chamber integral to its gun barrel, though in common usage the two terms are often used interchangeably. The English word was introduced in ca. 1570 – when early hand ...

pistol
s and
derringer The term "derringer" has come to refer to modern small-sized handgun that is neither a revolver nor a semi-automatic pistol, semi/machine pistol, fully automatic pistol. It is not to be confused with mini-revolvers or pocket pistols, although ...
s, and
long gun A long gun is a category of firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. water guns/ ...

long gun
s such as
rifle A rifle is a long-barrelled firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. water gun ...

rifle
s (including many subtypes such as anti-material rifles,
sniper rifle A sniper rifle is a high-precision, long range shooting, long-range rifle. Requirements include accuracy, reliability, mobility, concealment and optics for anti-personnel weapon, anti-personnel, anti-materiel rifle, anti-materiel and surveillanc ...

sniper rifle
s/
designated marksman rifle A designated marksman rifle (DMR) is a modern scoped high-precision Precision, precise or precisely may refer to: Science, and technology, and mathematics Mathematics and computing (general) * Accuracy and precision, measurement deviation f ...
s,
battle rifle A battle rifle is any military service rifle chambered to fire a fully powered cartridge. The term "battle rifle" is a retronym created largely out of a need to better differentiate the intermediate cartridge, intermediate-powered assault rifles ( ...
s, assault rifles and
carbine A carbine ( or ) is a long-barreled firearm whose gun barrel, barrel is shorter than that of a standard rifle or musket. Most carbines are shortened versions of full-length rifles, shooting the same type of ammunition, while others fire generally ...

carbine
s),
shotgun A shotgun (also known as a scattergun, or historically as a fowling piece) is a long-barreled firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid pr ...

shotgun
s,
submachine gun A submachine gun, abbreviated SMG, is a magazine A magazine is a periodical literature, periodical publication which is printing, printed in Coated paper, gloss-coated and Paint sheen, matte paper. Magazines are generally published on a regul ...
s/
personal defense weapon Personal defense weapons (PDWs) are a class of compact, selective fire, magazine (firearm), magazine-fed, submachine gun-like firearms. Most PDWs fire a small-caliber (less than ), high-velocity centerfire bottleneck cartridge (firearm), cartridg ...
s and
squad automatic weapon A squad automatic weapon (SAW), also known as a section automatic weapon or light support weapon (LSW), is a man-portable automatic firearm attached to infantry squads or section (military unit), sections as a source of rapid direct firepower. ...
s/
light machine gun A light machine gun (LMG) is a light-weight machine gun designed to be operated by a single infantryman, with or without an assistant, as an infantry support weapon. LMGs firing cartridge (firearms), cartridges of the same caliber as the othe ...
s. Among the world's
arms manufacturer The arms industry, also known as the arms trade, is a global industry classification, industry which manufacturing, manufactures and sells weapons and military technology, and is a major component of the military–industrial complex. It consists ...
s, the top firearms manufacturers are Browning, , Colt,
Ruger Sturm, Ruger & Company, Inc., better known by the shortened name Ruger, is an American company based in , with production facilities also in , , and . The company was founded in 1949 by and , and it has been publicly traded since 1969. Ruge ...
,
Smith & Wesson Smith & Wesson Brands, Inc. (S&W) is an American firearms manufacturer headquartered in Springfield, Massachusetts, Springfield, Massachusetts, United States. Smith & Wesson was founded by Horace Smith (inventor), Horace Smith and Daniel B. We ...
, Savage, Mossberg (USA),
Heckler & Koch Heckler & Koch GmbH (HK; ) is a German defence Defense or defence may refer to: Tactical, martial, and political acts or groups * Defense (military) A military, also known collectively as armed forces, is a heavily armed, highly organiz ...
,
SIG Sauer SIG Sauer is the brand name A brand is a name, term, design, symbol or any other feature that identifies one seller's good or service as distinct from those of other sellers. Brands are used in business Business is the activity of ...

SIG Sauer
, Walther (Germany), ČZUB (Czech Republic),
Glock Glock is a brand of polymer A polymer (; Greek ''wikt:poly-, poly-'', "many" + ''wikt:-mer, -mer'', "part") is a Chemical substance, substance or material consisting of very large molecules, or macromolecules, composed of many Repeat unit ...
, Steyr-Mannlicher (Austria),
FN Herstal Fabrique Nationale Herstal ( en, National Factory Herstal), self-identified as FN Herstal and often referred to as Fabrique Nationale or simply FN, is a leading firearm A firearm is any type of gun A gun is a ranged weapon designed to ...
(Belgium),
Beretta Fabbrica d'Armi Pietro Beretta (; "Pietro Beretta Gun Factory") is a privately held A privately held company, private company, or close corporation is a corporation not owned by the government, non-governmental organizations and by a relatively ...
(Italy),
Norinco The China Ordnance Industries Group Corporation Limited (), also known as China North Industries Group Corporation Limited (), officially abbreviated as Norinco ( zh, link=no, c=北方工业; ), is a Chinese state-owned defense contractor, defens ...
(China), and Kalashnikov (Russia), while former top producers included
Mauser Mauser, originally Königliche Waffen Schmieden, is a German . Their line of rifles and s has been produced since the 1870s for the German armed forces. In the late 19th and early 20th centuries, Mauser designs were also exported and licensed ...

Mauser
,
Springfield Armory The Springfield Armory, located in the city of Springfield, Massachusetts, was the primary center for the manufacture of United States military firearms from 1777 until its closing in 1968. It was the first federal armory and one of the first fa ...

Springfield Armory
, and Rock Island Armory under
Armscor (Philippines) The Arms Corporation of the Philippines (Armscor) is a firearms manufacturing company The following list of modern armament manufacturers presents arms industry, major companies producing modern weapons and munitions for military, paramilitary, gov ...
. the
Small Arms SurveyThe Small Arms Survey is an independent research project located at the Graduate Institute of International and Development Studies in Geneva , neighboring_municipalities= Carouge, Chêne-Bougeries, Cologny, Lancy, Grand-Saconnex, Pregny-Chamb ...
reported that there were over one billion firearms distributed globally, of which 857 million (about 85 percent) were in
civilian Civilians under international humanitarian law are "persons who are not members of the armed forces A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare War ...

civilian
hands. U.S. civilians alone account for 393 million (about 46 percent) of the worldwide total of civilian-held firearms. This amounts to "120.5 firearms for every 100 residents." The world's
armed forces A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare War is an intense armed conflict between State (polity), states, governments, Society, societies, or pa ...
control about 133 million (about 13 percent) of the global total of small arms, of which over 43 percent belong to two countries: the
Russian Federation Russia ( rus, link=no, Россия, Rossiya, ), or the Russian Federation, is a country spanning Eastern Europe and Northern Asia. It is the List of countries and dependencies by area, largest country in the world, covering over , and encom ...

Russian Federation
(30.3 million) and
China China (), officially the People's Republic of China (PRC; ), is a country in East Asia East Asia is the eastern region of Asia Asia () is Earth's largest and most populous continent, located primarily in the Eastern Hemisphere ...

China
(27.5 million).
Law enforcement agencies A law enforcement agency (LEA), in North American English, is any government agency responsible for the law enforcement, enforcement of the laws. Outside North America, such organizations are usually called police services. In North America, some o ...
control about 23 million (about 2 percent) of the global total of small arms.


Configuration


Handguns

Handguns are guns that can be used with a single hand, and are the smallest of all firearms. However, the legal definition of a "handgun" varies between countries and regions. For example, in South African law, a "handgun" means a pistol or revolver which can be held in and discharged with one hand. In Australia, the gun law considers a handgun as a firearm carry-able or concealable about the person; or capable of being raised and fired by one hand; or not exceeding . In the United States,
Title 18 Title 18 of the United States Code is the main criminal code of the federal government of the United States. The Title deals with federal crimes and criminal procedure. In its coverage, Title 18 is similar to most U.S. state criminal codes, wh ...
and the Bureau of Alcohol, Tobacco, Firearms and Explosives, ATF considers a handgun as a firearm which has a short buttstock, stock and is designed to be held and fired by the use of a single hand. There are two common types of handguns: revolvers and semi-automatic pistols. Revolvers have a number of firing chambers or "charge holes" in a revolving cylinder; each chamber in the cylinder is loaded with a single cartridge (firearms), cartridge or charge. Semi-automatic pistols have a single fixed firing-chamber machined into the rear of the barrel, and a magazine so they can be used to fire more than one round. Each press of the trigger fires a cartridge, using the energy of the cartridge to activate a mechanism so that the next cartridge may be fired immediately. This is opposed to "double-action" revolvers, which accomplish the same end using a mechanical action linked to the trigger pull. With the invention of the revolver in 1818, handguns capable of holding multiple rounds became popular. Certain designs of auto-loading pistol appeared beginning in the 1870s and had largely supplanted revolvers in military applications by the end of World War I. By the end of the 20th century, most handguns carried regularly by military, police and civilians were semi-automatic, although revolvers were still widely used. Generally speaking, military and police forces use semi-automatic pistols due to their high magazine capacities and ability to rapidly reload by simply removing the empty magazine and inserting a loaded one. Revolvers are very common among handgun hunters because revolver cartridges are usually more powerful than similar caliber semi-automatic pistol cartridges (which are designed for self-defense) and the strength, simplicity and durability of the revolver design is well-suited to outdoor use. Revolvers, especially in .22 LR and 38 Special/357 Magnum, are also common Concealed carry in the United States, concealed weapons in jurisdictions allowing this practice because their simple mechanics make them smaller than many autoloaders while remaining reliable. Both designs are common among civilian gun owners, depending on the owner's intention (self-defense, hunting, target shooting, competitions, collecting, etc.).


Long guns

A long gun is any firearm with a notably long barrel, typically a length of (there are restrictions on minimum barrel length in many jurisdictions; maximum barrel length is usually a matter of practicality). Unlike a handgun, long guns are designed to be held and fired with both hands, while braced against either the hip or the shoulder for better stability. The receiver and trigger group is mounted into a stock made of wood, plastic, metal, or composite material, which has sections that form a foregrip, rear grip, and optionally (but typically) a shoulder mount called the ''butt''. Early long arms, from the Renaissance up to the mid-19th century, were generally smoothbore firearms that fired one or more ball shot, called muskets or arquebus depending on caliber and firing mechanism.


=Rifles and shotguns

= Most modern long guns are either
rifle A rifle is a long-barrelled firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. water gun ...

rifle
s or
shotgun A shotgun (also known as a scattergun, or historically as a fowling piece) is a long-barreled firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid pr ...

shotgun
s. Both are the successors of the musket, diverging from their parent weapon in distinct ways. A rifle is so named for the spiral grooves (riflings) machined into the inner (bore) surface of its barrel, which imparts a gyroscopically-stabilizing spin to the bullets that it fires. Shotguns are predominantly
smoothbore A smoothbore weapon is one that has a without . Smoothbores range from handheld to powerful s and large artillery s. History Early firearms had smoothly bored barrels that fired s without significant spin. To minimize inaccuracy-inducing ...
firearms designed to fire a number of ''shot (pellet), shot'' in each discharge; pellet sizes commonly ranging between 2 mm #9 birdshot and 8.4 mm #00 (double-aught) buckshot. Shotguns are also capable of firing single solid projectiles called shotgun slug, slugs, or specialty (often "Non-lethal weapon, less lethal") rounds such as Bean bag round, bean bags, tear gas or breaching rounds. Rifles produce a single point of impact with each firing but a long range and high accuracy; while shotguns produce a cluster of impact points with considerably less range and accuracy. However, the larger impact area of shotguns can compensate for reduced accuracy, since shotgun shell#Spread, shot spreads during flight; consequently, in hunting, shotguns are generally used for fast-flying game birds. Rifles and shotguns are commonly used for hunting and often also for home defense, security guard and law enforcement. Usually, large game are hunted with rifles (although shotguns can be used, particularly with slugs), while birds are hunted with shotguns. Shotguns are sometimes preferred for defending a home or business due to their wide impact area, multiple wound tracks (when using buckshot), shorter range, and reduced penetration of walls (when using lighter shot), which significantly reduces the likelihood of unintended harm, although the handgun is also common. There are a variety of types of rifles and shotguns based on the method they are reloaded. Bolt-action and lever-action rifles are manually operated. Manipulation of the bolt or the lever causes the spent cartridge to be removed, the firing mechanism recocked, and a fresh cartridge inserted. These two types of action are almost exclusively used by rifles. Slide-action (commonly called 'pump-action') rifles and shotguns are manually cycled by shuttling the foregrip of the firearm back and forth. This type of action is typically used by shotguns, but several major manufacturers make rifles that use this action. Both rifles and shotguns also come in break-action varieties that do not have any kind of reloading mechanism at all but must be hand-loaded after each shot. Both rifles and shotguns come in single- and double-barreled varieties; however, due to the expense and difficulty of manufacturing, double-barreled rifles are rare. Double-barreled rifles are typically intended for African big-game hunts where the animals are dangerous, ranges are short, and speed is of the essence. Very large and powerful calibers are normal for these firearms. Rifles have been in nationally featured marksmanship events in Europe and the United States since at least the 18th century, when rifles were first becoming widely available. One of the earliest purely "American" rifle-shooting competitions took place in 1775, when Daniel Morgan was recruiting sharpshooters in Virginia for the impending American Revolutionary War. In some countries, rifle marksmanship is still a matter of national pride. Some specialized rifles in the larger calibers are claimed to have an accurate range of up to about , although most have considerably less. In the second half of the 20th century, competitive shotgun sports became perhaps even more popular than riflery, largely due to the motion and immediate feedback in activities such as skeet, trap and sporting clays. In military use, bolt-action rifles with high-power scopes are common as sniper rifles, however by the Korean War the traditional bolt-action and semi-automatic rifles used by infantrymen had been supplemented by select-fire designs known as automatic rifles.


=Carbines

= A carbine is a firearm similar to a rifle in form and intended usage, but generally shorter or smaller than the typical "full-size" hunting or battle rifle of a similar time period, and sometimes using a smaller or less-powerful cartridge. Carbines were and are typically used by members of the military in roles that are expected to engage in combat, but where a full-size rifle would be an impediment to the primary duties of that soldier (vehicle drivers, field commanders and support staff, airborne troops, engineers, etc.). Carbines are also common in law enforcement and among civilian owners where similar size, space and/or power concerns may exist. Carbines, like rifles, can be single-shot, repeating-action, semi-automatic or select-fire/fully automatic, generally depending on the time period and intended market. Common historical examples include the Winchester Model 1892, Lee–Enfield "Jungle Carbine", SKS, M1 carbine (no relation to the larger M1 Garand) and M4 carbine (a more compact variant of the current M16 rifle). Modern U.S. civilian carbines include compact customizations of the AR-15, Ruger Mini-14, Beretta Cx4 Storm, Kel-Tec SUB-2000, bolt-action rifles generally falling under the specifications of a scout rifle, and aftermarket conversion kits for popular pistols including the M1911 pistol, M1911 and Glock models.


=Machine guns

= A machine gun is a fully automatic firearm, most often separated from other classes of automatic weapons by the use of belt-fed ammunition (though some designs employ drum, pan or hopper magazines), generally in a rifle-inspired caliber ranging between 5.56×45mm NATO (.223 Remington) for a
light machine gun A light machine gun (LMG) is a light-weight machine gun designed to be operated by a single infantryman, with or without an assistant, as an infantry support weapon. LMGs firing cartridge (firearms), cartridges of the same caliber as the othe ...
to as large as .50 BMG or even larger for crewed or aircraft weapons. Although not widely fielded until World War I, early machine guns were being used by militaries in the second half of the 19th century. Notables in the U.S. arsenal during the 20th century included the M2 Browning .50 caliber heavy machine gun, M1919 Browning machine gun, M1919 Browning .30 caliber medium machine gun, and the M60 machine gun, M60 7.62×51mm NATO general-purpose machine gun which came into use around the Vietnam War. Machine guns of this type were originally defensive firearms crewed by at least two men, mainly because of the difficulties involved in moving and placing them, their ammunition, and their tripod. In contrast, modern
light machine gun A light machine gun (LMG) is a light-weight machine gun designed to be operated by a single infantryman, with or without an assistant, as an infantry support weapon. LMGs firing cartridge (firearms), cartridges of the same caliber as the othe ...
s such as the FN Minimi are often wielded by a single infantryman. They provide a large ammunition capacity and a high rate of fire, and are typically used to give suppressing fire during infantry movement. Accuracy on machine guns varies based on a wide number of factors from design to manufacturing tolerances, most of which have been improved over time. Machine guns are often mounted on vehicles or helicopters and have been used since World War I as offensive firearms in fighter aircraft and tanks (e.g. for air combat or suppressing fire for ground troop support). The definition of a machine gun is different in U.S. law. The National Firearms Act and Firearm Owners Protection Act define a "machine gun" in the United States code ''Title 26, Subtitle E, Chapter 53, Subchapter B, Part 1, § 5845'' as: "... any firearm which shoots ... automatically more than one shot, without manual reloading, by a single function of the trigger". "Machine gun" is therefore largely synonymous with "automatic weapon" in the U.S. civilian parlance, covering all automatic firearms.


=Sniper rifles

= The definition of a sniper rifle is disputed among military, police and civilian observers alike, however most generally define a “sniper rifle” as a high powered, semi-automatic/bolt action, precision rifle with an accurate range further than that of a standard rifle. These are often purpose-built for their applications. For example, a police sniper rifle may differ in specs from a military rifle. Police snipers generally do not engage targets at extreme range, but rather, a target at medium range. They may also have multiple targets within the shorter range, and thus a semi-automatic model is preferred to a bolt action. They also may be more compact than mil-spec rifles as police marksmen may need more portability. On the other hand, a military rifle is more likely to use a higher-powered cartridge to defeat body armor or medium-light cover. They are more commonly (but not a lot more) bolt-action, as they are simpler to build and maintain. Also, due to fewer moving and overall parts, they are much more reliable under adverse conditions. They may also have a more powerful scope to acquire targets further away. Overall, sniper units never became prominent until World War I, when the Germans displayed their usefulness on the battlefield. Since then, they have become irrevocably embedded in warfare. Examples of sniper rifles include the Accuracy International AWM, Sako TRG-42 and the CheyTac M200. Examples of specialized sniper cartridges include the .338 Lapua Magnum, .300 Winchester Magnum, and .408 CheyTac rounds.


=Submachine guns

= A submachine gun is a magazine-fed firearm, usually smaller than other automatic firearms, that fires
pistol A pistol is a handgun, more specifically one with the chamber (firearms), chamber integral to its gun barrel, though in common usage the two terms are often used interchangeably. The English word was introduced in ca. 1570 – when early hand ...

pistol
-caliber ammunition; for this reason certain submachine guns can also be referred to as ''machine pistols'', especially when referring to handgun-sized designs such as the Škorpion vz. 61 and Glock#9×19mm Parabellum, Glock 18. Well-known examples are the Israeli Uzi and Heckler & Koch MP5 which use the 9×19mm Parabellum cartridge, and the American Thompson submachine gun which fires .45 ACP. Because of their small size and limited projectile penetration compared to high-power rifle rounds, submachine guns are commonly favored by military, paramilitary and police forces for close-quarters engagements such as inside buildings, in urban areas or in trench complexes. Submachine guns were originally about the size of carbines. Because they fire pistol ammunition, they have limited long-range use, but in close combat can be used in fully automatic in a controllable manner due to the lighter recoil of the pistol ammunition. They are also extremely inexpensive and simple to build in time of war, enabling a nation to quickly arm its military. In the latter half of the 20th century, submachine guns were being miniaturized to the point of being only slightly larger than some large handguns. The most widely used submachine gun at the end of the 20th century was the Heckler & Koch MP5. The MP5 is actually designated as a "machine pistol" by Heckler & Koch (MP5 stands for ''Maschinenpistole 5'', or Machine Pistol 5), although some reserve this designation for even smaller submachine guns such as the MAC-10 and Glock#9×19mm Parabellum, Glock 18, which are about the size and shape of pistols.


=Automatic rifles

= An automatic rifle is a magazine-fed firearm, wielded by a single infantryman, that is chambered for rifle cartridges and capable of automatic fire. The M1918 Browning Automatic Rifle was the first U.S. infantry weapon of this type, and was generally used for suppressive or support fire in the role now usually filled by the
light machine gun A light machine gun (LMG) is a light-weight machine gun designed to be operated by a single infantryman, with or without an assistant, as an infantry support weapon. LMGs firing cartridge (firearms), cartridges of the same caliber as the othe ...
. Other early automatic rifles include the Fedorov Avtomat and the Huot Automatic Rifle. Later, German forces fielded the StG 44, Sturmgewehr 44 during World War II, a light automatic rifle firing a reduced power "intermediate cartridge". This design was to become the basis for the " assault rifle" subclass of automatic weapons, as contrasted with "
battle rifle A battle rifle is any military service rifle chambered to fire a fully powered cartridge. The term "battle rifle" is a retronym created largely out of a need to better differentiate the intermediate cartridge, intermediate-powered assault rifles ( ...
s", which generally fire a traditional "full-power" rifle cartridge.


=Assault rifles

= In World War II, Germany introduced the StG 44, and brought to the forefront of firearm technology what eventually became the class of firearm most widely adopted by the military, the assault rifle. An assault rifle is usually slightly smaller than a
battle rifle A battle rifle is any military service rifle chambered to fire a fully powered cartridge. The term "battle rifle" is a retronym created largely out of a need to better differentiate the intermediate cartridge, intermediate-powered assault rifles ( ...
such as the American M14, but the chief differences defining an assault rifle are Selective fire, select-fire capability and the use of a rifle round of lesser power, known as an intermediate cartridge. Soviet engineer Mikhail Kalashnikov quickly adapted the German concept, using a less-powerful 7.62×39mm cartridge derived from the standard 7.62×54mmR Russian battle rifle round, to produce the AK-47, which has become the world's most widely used assault rifle. Soon after World War II, the Automatic Kalashnikov AK-47 assault rifle began to be fielded by the Soviet Union and its allies in the Eastern Bloc, as well as by nations such as China, North Korea, and North Vietnam. In the United States, the assault rifle design was later in coming; the replacement for the M1 Garand of WWII was another John Garand design chambered for the new 7.62×51mm NATO cartridge; the select-fire M14 rifle, M14, which was used by the U.S. military until the 1960s. The significant recoil of the M14 when fired in full-automatic mode was seen as a problem as it reduced accuracy, and in the 1960s it was replaced by Eugene Stoner's AR-15, which also marked a switch from the powerful .30 caliber cartridges used by the U.S. military up until early in the Vietnam War to the much less powerful but far lighter and light recoiling .223 caliber (5.56mm) intermediate cartridge. The military later designated the AR-15 as the "M16 rifle, M16". The civilian version of the M16 continues to be known as the AR-15 and looks exactly like the military version, although to conform to Bureau of Alcohol, Tobacco, Firearms and Explosives, ATF regulations in the U.S., it lacks the mechanism that permits fully automatic fire. Variants of both of the M16 and AK-47 are still in wide international use today, though other automatic rifle designs have since been introduced. A smaller version of the M16A2, the M4 carbine, is widely used by U.S. and NATO tank and vehicle crews, airbornes, support staff, and in other scenarios where space is limited. The IMI Galil, an Israeli-designed weapon based on the action of the AK-47, is in use by Israel, Italy, Burma, the Philippines, Peru, and Colombia. Swiss Arms of Switzerland produces the SIG SG 550 assault rifle used by France, Chile, and Spain among others, and Steyr Mannlicher produces the Steyr AUG, AUG, a bullpup rifle in use in Austria, Australia, New Zealand, Ireland, and Saudi Arabia among other nations. Modern designs call for compact weapons retaining firepower. The bullpup design, by mounting the magazine behind the trigger, unifies the accuracy and firepower of the traditional assault rifle with the compact size of the submachine gun (though submachine guns are still used); examples are the French FAMAS and the British SA80.


=Personal defense weapons

= A recently developed class of firearm is the
personal defense weapon Personal defense weapons (PDWs) are a class of compact, selective fire, magazine (firearm), magazine-fed, submachine gun-like firearms. Most PDWs fire a small-caliber (less than ), high-velocity centerfire bottleneck cartridge (firearm), cartridg ...
or PDW, which is in simplest terms a
submachine gun A submachine gun, abbreviated SMG, is a magazine A magazine is a periodical literature, periodical publication which is printing, printed in Coated paper, gloss-coated and Paint sheen, matte paper. Magazines are generally published on a regul ...
designed to fire ammunitions with ballistic performance similar to rifle cartridges. While a submachine gun is desirable for its compact size and ammunition capacity, its pistol cartridges lack the penetrating capability of a rifle round. Conversely, rifle bullets can pierce light armor and are easier to shoot accurately, but even a
carbine A carbine ( or ) is a long-barreled firearm whose gun barrel, barrel is shorter than that of a standard rifle or musket. Most carbines are shortened versions of full-length rifles, shooting the same type of ammunition, while others fire generally ...

carbine
such as the Colt M4 is larger and/or longer than a submachine gun, making it harder to maneuver in close quarters. The solution many firearms manufacturers have presented is a weapon resembling a submachine gun in size and general configuration, but which fires a higher-powered armor-penetrating round (often specially designed for the weapon), thus combining the advantages of a carbine and submachine gun. This also earned the PDWs an infrequently used nickname — the submachine carbines. The FN P90 and Heckler & Koch MP7 are most famous examples of PDWs.


=Battle rifles

= Battle rifles are another subtype of rifle, usually defined as selective fire rifles that use full power rifle cartridges, examples of which include the 7.62x51mm NATO, 7.92x57mm Mauser, and 7.62x54mmR. These serve similar purposes as assault rifles, as they both are usually employed by ground infantry. However, some prefer battle rifles due to their more powerful cartridge, despite added recoil. Some semi-automatic sniper rifles are configured from battle rifles.


Function

Firearms are also categorized by their functioning cycle or "action" which describes its loading, firing, and unloading cycle.


Manual

The earliest evolution of the firearm, there are many types of manual action firearms. These can be divided into two basic categories: single shot and Repeating rifle, repeating. A single shot firearm can only be fired once per equipped barrel before it must be reloaded or charged via an external mechanism or series of steps. A repeating firearm can be fired multiple times, but can only be fired once with each subsequent pull of the trigger. Between trigger pulls, the firearm's action must be reloaded or charged via an internal mechanism.


Lever action

A gun which has a lever that is pulled down then back up to expel the old cartridge then load a new round.


Pump action

Pump action weapons are primarily shotguns. A pump action is created when the user slides a lever (usually a grip) and it brings a new round in the chamber while expelling the old one.


Semi-automatic

A semi-automatic, self-loading, or "auto loader" firearm is one that performs all steps necessary to prepare it for firing again after a single discharge, until cartridges are no longer available in the weapon's feed device or magazine. Auto loaders fire one round with each pull of the trigger. Some people confuse the term with "fully automatic" firearms. (See next.) While some semi-automatic rifles may resemble military-style firearms, they are not properly classified "Assault Weapons" which refers to those that continue to fire until the trigger is no longer depressed.


Automatic

An ''automatic'' firearm, or "fully automatic", "fully auto", or "full auto", is generally defined as one that continues to load and fire cartridges from its magazine as long as the trigger is depressed (and until the magazine is depleted of available ammunition.) The first weapon generally considered in this category is the
Gatling gun The Gatling gun is a rapid-firing multiple-barrel firearm A multiple barrel firearm is any type of firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further in d ...

Gatling gun
, originally a carriage-mounted, crank-operated firearm with multiple rotating barrels that was fielded in the American Civil War. The modern trigger-actuated machine gun began with various designs developed in the late 19th century and fielded in World War I, such as the Maxim gun, Lewis Gun, and MG 08, MG 08 "Spandau". Most automatic weapons are classed as long guns (as the ammunition used is of similar type as for rifles, and the recoil of the weapon's rapid fire is better controlled with two hands), but handgun-sized automatic weapons also exist, generally in the "submachine gun" or "machine pistol" class.


Selective fire

Selective fire, or "select fire", means the capability of a weapon's fire control to be adjusted in either semi-automatic, fully automatic firing modes, or 3 round burst. The modes are chosen by means of a selector, which varies depending on the weapon's design. Some selective-fire weapons have burst mode (weapons), burst fire mechanisms built in to limit the maximum number of shots fired in fully automatic mode, with most common limits being two or three rounds per trigger pull. The presence of selective-fire modes on firearms allows more efficient use of ammunition for specific tactical needs, either precision-aimed or suppressive fire. This capability is most commonly found on military weapons of the 20th and 21st centuries, most notably the assault rifles.


History

The first primitive firearms were invented about 1250 AD in
China China (), officially the People's Republic of China (PRC; ), is a country in . It is the world's , with a of more than 1.4 billion. China spans five geographical and 14 different countries, the in the world after . Covering an area of ap ...
when the man-portable
fire lance Fire is the rapid oxidation of a material (the fuel) in the exothermic chemical process of combustion, releasing heat, light, and various reaction Product (chemistry), products. Fire is hot because the conversion of the weak double bond in m ...

fire lance
(a bamboo or metal tube that could shoot ignited
gunpowder Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produces lower amounts of smoke when fired, unlike black powder. The ter ...
) was combined with projectiles such as scrap metal, broken porcelain, or darts/arrows. The earliest depiction of a firearm is a sculpture from a cave in Sichuan, China. The sculpture dates to the 12th century and is of a figure carrying a vase-shaped Bombard (weapon), bombard, with flames and a Round shot, cannonball coming out of it. The oldest surviving gun, a
hand cannon The hand cannon (Chinese Chinese can refer to: * Something related to China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the List of countries and dependencies by population, world's most popu ...

hand cannon
made of bronze, has been dated to 1288 because it was discovered at a site in modern-day Acheng District, Heilongjiang, China, where the ''Yuan Shi'' records that battles were fought at that time. The firearm had a 6.9 inch barrel of a 1-inch diameter, a 2.6 inch chamber for the gunpowder and a socket for the firearm's handle. It is 13.4 inches long and 7.8 pounds without the handle, which would have been made of wood. The Arabs and Mamluks had firearms in the late 13th century. In the 14th century, firearms were obtained by the Europeans. The Koreans adopted firearms from the Chinese in the 14th century. The Iranians (first Aq Qoyunlu and Safavids) and Indians (first Mughal Empire, Mughals) all got them no later than the 15th century, from the Ottoman Turks. The people of Nusantara archipelago of Southeast Asia used Java arquebus, long arquebus at least by the last quarter of 15th century. Even though the knowledge of making gunpowder-based weapon in Nusantara archipelago has been known after the failed Mongol invasion of Java (1293), and the predecessor of firearms, the Hand cannon, pole gun (bedil tombak), was recorded as being used by Java in 1413, the knowledge of making "true" firearms came much later, after the middle of 15th century. It was brought by the Islamic nations of West Asia, most probably the Arabs. The precise year of introduction is unknown, but it may be safely concluded to be no earlier than 1460. Before the arrival of the Portuguese in Southeast Asia, the natives already possessed firearms, the Java arquebus. The technology of firearm in Southeast Asia further improved after the Capture of Malacca (1511), Portuguese capture of Malacca (1511). Starting in the 1513, the tradition of German-Bohemian gun making were merged with Turkish gun making traditions.''The bewitched gun : the introduction of the firearm in the Far East by the Portuguese'', by Rainer Daehnhardt 1994. This resulted in Indo-Portuguese tradition of matchlocks. Indian craftsmen modified the design by introducing a very short, almost pistol-like buttstock held against the cheek, not the shoulder, when aiming. They also reduced the caliber and made the gun lighter and more balanced. This was a hit with the Portuguese who did a lot of fighting aboard ship and on river craft, and valued a more compact gun. The Malacca Sultanate, Malaccan gunfounders, compared as being in the same level with those of Germany, quickly adapted these new firearms, and thus a new type of arquebus, the istinggar, appeared. The Japanese did not acquire firearms until the 16th century, and then from the Portuguese rather than the Chinese. The development behind firearms accelerated during the 19th and 20th centuries. Breech-loading became more or less a universal standard for the reloading of most hand-held firearms and continues to be so with some notable exceptions (such as mortars). Instead of loading individual rounds into weapons, magazines holding multiple munitions were adopted—these aided rapid reloading. Automatic and semi-automatic firing mechanisms meant that a single soldier could fire many more rounds in a minute than a vintage weapon could fire over the course of a battle. Polymers and alloys in firearm construction made weaponry progressively lighter and thus easier to deploy. Ammunition changed over the centuries from simple metallic ball-shaped projectiles that rattled down the barrel to bullets and cartridges manufactured to high precision. Especially in the past century has particular attention been devoted to accuracy and sighting to make firearms altogether far more accurate than ever before. More than any single factor though, firearms have proliferated due to the advent of mass production—enabling arms manufacturers to produce large quantities of weaponry to a consistent standard. Velocities of bullets increased with the use of a "jacket" of a metal such as copper or copper alloys that covered a lead core and allowed the bullet to glide down the barrel more easily than exposed lead. Such bullets are designated as "full metal jacket" (FMJ). Such FMJ bullets are less likely to fragment on impact and are more likely to traverse through a target while imparting less energy. Hence, FMJ bullets impart less tissue damage than non-jacketed bullets that expand. (Dougherty and Eidt, 2009) This led to their adoption for military use by countries adhering to the Hague Convention in 1899. That said, the basic principle behind firearm operation remains unchanged to this day. A musket of several centuries ago is still similar in principle to a modern-day assault rifle—using the expansion of gases to propel projectiles over long distances—albeit less accurately and rapidly.


Evolution


Early models


=Fire lances

= The Chinese
fire lance Fire is the rapid oxidation of a material (the fuel) in the exothermic chemical process of combustion, releasing heat, light, and various reaction Product (chemistry), products. Fire is hot because the conversion of the weak double bond in m ...

fire lance
from the 10th century was the direct predecessor to the modern concept of the firearm. It was not a gun itself, but an addition to the soldiers' spears. Originally it consisted of paper or bamboo barrels that would have incendiary gunpowder within it, that could be lit one time and would project flames at the enemy. Sometimes the Chinese troops would place small projectiles within the barrel that would also be projected when the gunpowder was lit, but most of the explosive force would create flames. Later, the barrel was changed to be made of metal, so that a more explosive gunpowder could be used and put more force into the propulsion of the projectile.


=Hand cannons

= The original predecessor of all firearms, the Chinese
fire lance Fire is the rapid oxidation of a material (the fuel) in the exothermic chemical process of combustion, releasing heat, light, and various reaction Product (chemistry), products. Fire is hot because the conversion of the weak double bond in m ...

fire lance
and
hand cannon The hand cannon (Chinese Chinese can refer to: * Something related to China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the List of countries and dependencies by population, world's most popu ...

hand cannon
were loaded with gunpowder and the shot (initially lead shot, later replaced by cast iron) through the muzzle, while a fuse was placed at the rear. This fuse was lit, causing the gunpowder to ignite and propel the cannonball. In military use, the standard hand cannon was tremendously powerful, while also being somewhat useless due to relative inability of the gunner to aim the weapon, or control the ballistic properties of the projectile. Recoil could be absorbed by bracing the barrel against the ground using a wooden support, the forerunner of the Stock (firearms), stock. Neither the quality or amount of gunpowder, nor the consistency in projectile dimensions were controlled, with resulting inaccuracy in firing due to windage, variance in gunpowder composition, and the difference in diameter between the Caliber, bore and the shot. The
hand cannon The hand cannon (Chinese Chinese can refer to: * Something related to China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the List of countries and dependencies by population, world's most popu ...

hand cannon
s were replaced by lighter carriage-mounted artillery pieces, and ultimately the arquebus. In the 1420s gunpowder was used to propel missiles from hand-held tubes during History of Czech civilian firearms possession#Origins of civilian firearms possession, the Hussite revolt.


=Muskets

= Muzzleloader, Muzzle-loading muskets (smooth-bored long guns) were among the first firearms developed. The firearm was loaded through the muzzle with gunpowder, optionally some wadding and then a bullet (usually a solid lead ball, but musketeers could shoot stones when they ran out of bullets). Greatly improved muzzleloaders (usually rifled instead of smooth-bored) are manufactured today and have many enthusiasts, many of whom hunt large and small game with their guns. Muzzleloaders have to be manually reloaded after each shot; a skilled archer could fire multiple arrows faster than most early muskets could be reloaded and fired, although by the mid-18th century, when muzzleloaders became the standard small armament of the military, a well-drilled soldier could fire six rounds in a minute using prepared cartridges in his musket. Before then, effectiveness of muzzleloaders was hindered by both the low reloading speed and, before the firing mechanism was perfected, the very high risk posed by the firearm to the person attempting to fire it. One interesting solution to the reloading problem was the "Roman Candle Gun" with superposed loads. This was a muzzleloader in which multiple charges and balls were loaded one on top of the other, with a small hole in each ball to allow the subsequent charge to be ignited after the one ahead of it was ignited. It was neither a very reliable nor popular firearm, but it enabled a form of "automatic" fire long before the advent of the machine gun.


Loading techniques

Most early firearms were muzzle-loading. This form of loading has several disadvantages, such as a slow rate of fire and having to expose oneself to enemy fire to reload as the weapon had to be pointed upright so the powder could be poured through the muzzle into the breech followed by the ramming the projectile into the breech. As effective methods of sealing the breech were developed through the development of sturdy, weatherproof, self-contained metallic cartridges, muzzle-loaders were replaced by single-shot breech loaders. Eventually single-shot weapons were replaced by the following repeater type weapons.


Internal magazines

Many firearms made in the late 19th century through the 1950s used internal magazines to load the cartridge into the chamber of the weapon. The most notable and revolutionary weapons of this period appeared during the U.S. Civil War and they were the Spencer rifle, Spencer and Henry rifle, Henry repeating rifles. Both used fixed tubular magazines, the former having the magazine in the buttstock and the latter under the barrel which allowed a larger capacity. Later weapons used fixed box magazines that could not be removed from the weapon without disassembling the weapon itself. Fixed magazines permitted the use of larger cartridges and eliminated the hazard of having the bullet of one cartridge butting next to the primer or rim of another cartridge. These magazines are loaded while they are in the weapon, often using a stripper clip. A clip is used to transfer cartridges into the magazine. Some notable weapons that use internal magazines include the Mosin–Nagant, the Mauser Kar 98k, the Springfield M1903, the M1 Garand, and the SKS. Firearms that have internal magazines are usually, but not always, rifles. Some exceptions to this include the Mauser C96 pistol, which uses an internal magazine, and the Breda 30, an Italian light machine gun.


Detachable magazines

Many modern firearms use what are called detachable or box magazines as their method of chambering a cartridge. Detachable magazines can be removed from the weapon without disassembling the firearms, usually by pushing the magazine release.


Belt-fed weapons

A belt or ammunition belt is a device used to retain and feed cartridges into a firearm commonly used on machine guns. Belts were originally composed of canvas or cloth with pockets spaced evenly to allow the belt to be mechanically fed into the gun. These designs were prone to malfunctions due to the effects of oil and other contaminants altering the belt. Later belt designs used permanently connected metal links to retain the cartridges during feeding. These belts were more tolerant to exposure to solvents and oil. Some notable weapons that use belts are the M240, the M249, the M134 Minigun, and the PK Machine Gun.


Firing mechanisms


=Matchlock

= Matchlocks were the first and simplest firearms firing mechanisms developed. Using the matchlock mechanism, the powder in the gun barrel was ignited by a piece of burning cord called a "match". The match was wedged into one end of an S-shaped piece of steel. As the trigger (often actually a lever) was pulled, the match was brought into the open end of a "touch hole" at the base of the gun barrel, which contained a very small quantity of gunpowder, igniting the main charge of gunpowder in the gun barrel. The match usually had to be relit after each firing. The main parts to the matchlock firing mechanism are the pan, match, arm and trigger. A benefit of the pan and arm swivel being moved to the side of the gun was it gave a clear line of fire. An advantage to the matchlock firing mechanism is that it did not misfire. However, it also came with some disadvantages. One disadvantage was if it was raining the match could not be kept lit to fire the weapon. Another issue with the match was it could give away the position of soldiers because of the glow, sound, and smell. While European pistols were equipped with wheellock and flintlock mechanism, Asian pistols were equipped with matchlock mechanism.


=Wheellock

= The
wheellock , c. 1580 A wheellock, wheel-lock or wheel lock is a friction-wheel mechanism which creates a spark that causes a firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined furth ...
action, a successor to the matchlock, predated the flintlock. Despite its many faults, the wheellock was a significant improvement over the matchlock in terms of both convenience and safety, since it eliminated the need to keep a smoldering match in proximity to loose gunpowder. It operated using a small wheel much like that on Lighter, cigarette lighters which was wound up with a key before use and which, when the trigger was pulled, spun against a flint, creating the shower of sparks that ignited the powder in the touch hole. Supposedly invented by Leonardo da Vinci, the Italian Polymath, Renaissance man, the wheellock action was an innovation that was not widely adopted due to the high cost of the clockwork mechanism.


=Flintlock

= The
flintlock Flintlock is a general term for any firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. ...

flintlock
action was a major innovation in firearm design. The spark used to ignite the gunpowder in the touch hole was supplied by a sharpened piece of flint clamped in the jaws of a "cock" which, when released by the trigger, struck a piece of steel called the "frizzen" to create the necessary sparks. (The spring-loaded arm that holds a piece of flint or pyrite is referred to as a cock because of its resemblance to a rooster.) The cock had to be manually reset after each firing, and the flint had to be replaced periodically due to wear from striking the frizzen. (See also flintlock mechanism, snaphance, Miquelet lock) The flintlock was widely used during the 17th, 18th, and 19th centuries in both muskets and rifles.


=Percussion cap

= Percussion caps (caplock mechanisms), coming into wide service in the early 19th century, were a dramatic improvement over flintlocks. With the percussion cap mechanism, the small primer charge of gunpowder used in all preceding firearms was replaced by a completely self-contained explosive charge contained in a small brass "cap". The cap was fastened to the touch hole of the gun (extended to form a "nipple") and ignited by the impact of the gun's "hammer". (The hammer is roughly the same as the cock found on flintlocks except that it does not clamp onto anything.) In the case of percussion caps the hammer was hollow on the end to fit around the cap in order to keep the cap from fragmenting and injuring the shooter. Once struck, the flame from the cap in turn ignited the main charge of gunpowder, as with the flintlock, but there was no longer any need to charge the touch hole with gunpowder, and even better, the touch hole was no longer exposed to the elements. As a result, the percussion cap mechanism was considerably safer, far more weatherproof, and vastly more reliable (cloth-bound cartridges containing a premeasured charge of gunpowder and a ball had been in regular military service for many years, but the exposed gunpowder in the entry to the touch hole had long been a source of misfires). All
muzzleloader A muzzleloader is any firearm A firearm is any type of gun A gun is a ranged weapon designed to use a shooting tube ( gun barrel) to launch typically solid projectiles, but can also project pressurized liquid (e.g. water guns/ cannons ...

muzzleloader
s manufactured since the second half of the 19th century use percussion caps except those built as replicas of the flintlock or earlier firearms.


Cartridges

Frenchman Louis-Nicolas Flobert invented the first rimfire ammunition, rimfire metallic cartridge in 1845. His cartridge consisted of a percussion cap with a bullet attached to the top. Flobert then made what he called "parlor guns" for this cartridge, as these rifles and pistols were designed to be shot in indoor shooting parlors in large homes. These 6mm Flobert cartridges, do not contain any powder, the only
propellant A propellant (or propellent) is a that is expelled or expanded in such a way as to create a or other in accordance with , and "propel" a vehicle, , or payload. In vehicles, the engine that expels the propellant is called a . Although technical ...
substance contained in the cartridge is the percussion cap. In English-speaking countries, the 6mm Flobert cartridge corresponds to .22 BB Cap and .22 CB Cap ammunition. These cartridges have a relatively low muzzle velocity of around 700 ft/s (210 m/s). This was major innovation in firearms ammunition, previously delivered as separate bullets and powder, was combined in a single metallic (usually brass) Cartridge (firearms), cartridge containing a percussion cap, powder, and a bullet in one weatherproof package. The main technical advantage of the brass cartridge case was the effective and reliable sealing of high pressure gasses at the breech, as the gas pressure forces the cartridge case to expand outward, pressing it firmly against the inside of the gun barrel chamber. This prevents the leakage of hot gas which could injure the shooter. The brass cartridge also opened the way for modern repeating arms, by uniting the bullet, gunpowder and primer into one assembly that could be fed reliably into the breech by a mechanical action in the firearm. Before this, a "cartridge" was simply a premeasured quantity of
gunpowder Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder Smokeless powder is a type of propellant used in firearms and artillery that produces lower amounts of smoke when fired, unlike black powder. The ter ...
together with a ball in a small cloth bag (or rolled paper cylinder), which also acted as wadding for the charge and ball. This early form of cartridge had to be rammed into the muzzleloader's barrel, and either a small charge of gunpowder in the touch hole or an external percussion cap mounted on the touch hole ignited the gunpowder in the cartridge. Cartridges with built-in percussion caps (called "primers") continue to this day to be the standard in firearms. In cartridge-firing firearms, a hammer (or a firing pin struck by the hammer) strikes the cartridge primer, which then ignites the gunpowder within. The primer charge is at the base of the cartridge, either within the rim (a "rimfire ammunition, rimfire" cartridge) or in a small percussion cap embedded in the center of the base (a "centerfire" cartridge). As a rule, centerfire cartridges are more powerful than rimfire cartridges, operating at considerably higher pressures than rimfire cartridges. Centerfire cartridges are also safer, as a dropped rimfire cartridge has the potential to discharge if its rim strikes the ground with sufficient force to ignite the primer. This is practically impossible with most centerfire cartridges. Nearly all contemporary firearms load cartridges directly into their Breech-loading weapon, breech. Some additionally or exclusively load from a Magazine (firearms), magazine that holds multiple cartridges. A magazine is defined as a part of the firearm which exists to store ammunition and assist in its feeding by the action into the breech (such as through the rotation of a revolver's cylinder or by spring-loaded platforms in most pistol and rifle designs). Some magazines, such as that of most centerfire hunting rifles and all revolvers, are internal to and inseparable from the firearm, and are loaded by using a "clip". A clip (ammunition), clip, often mistakingly used to refer to a detachable "magazine", is a device that holds the ammunition by the rim of the case and is designed to assist the shooter in reloading the firearm's magazine. Examples include revolver speedloaders, the stripper clip used to aid loading rifles such as the Lee–Enfield or Mauser 98, and the En-bloc clip#En bloc, en-bloc clip used in loading the M1 Garand. In this sense, "magazines" and "clips", though often used synonymously, refer to different types of devices.


Repeating, semi-automatic, and automatic firearms

Many firearms are "single shot": i.e., each time a cartridge is fired, the operator must manually re-cock the firearm and load another cartridge. The classic single-barreled shotgun is a good example. A firearm that can load multiple cartridges as the firearm is re-cocked is considered a "repeating firearm" or simply a "repeater". A lever-action rifle, a pump-action shotgun, and most bolt-action rifles are good examples of repeating firearms. A firearm that automatically re-cocks and reloads the next round with each trigger pull is considered a semi-automatic or autoloading firearm. The first "rapid firing" firearms were usually similar to the 19th century
Gatling gun The Gatling gun is a rapid-firing multiple-barrel firearm A multiple barrel firearm is any type of firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further in d ...

Gatling gun
, which would fire cartridges from a magazine as fast as and as long as the operator turned a crank. Eventually, the "rapid" firing mechanism was perfected and miniaturized to the extent that either the recoil of the firearm or the gas pressure from firing could be used to operate it, thus the operator needed only to pull a trigger (which made the firing mechanisms truly "automatic"). An Automatic firearm, automatic (or "fully automatic") firearm is one that automatically re-cocks, reloads, and fires as long as the trigger is depressed. An automatic firearm is capable of firing multiple rounds with one pull of the trigger. The
Gatling gun The Gatling gun is a rapid-firing multiple-barrel firearm A multiple barrel firearm is any type of firearm A firearm is any type of gun designed to be readily carried and used by an individual. The term is legally defined further in d ...

Gatling gun
may have been the first automatic weapon, though the modern trigger-actuated machine gun was not widely introduced until the World War I, First World War with the German "MG 08, Spandau" and British Lewis Gun. Automatic rifles such as the Browning Automatic Rifle were in common use by the military during the early part of the 20th century, and automatic rifles that fired handgun rounds, known as submachine guns, also appeared in this time. Many modern military firearms have a selective fire option, which is a mechanical switch that allows the firearm be fired either in the semi-automatic or fully automatic mode. In the current M16A2 and M16A4 variants of the U.S.-made M16 rifle, M16, continuous fully automatic fire is not possible, having been replaced by an automatic burst of three cartridges (this conserves ammunition and increases controllability). Automatic weapons are largely restricted to military and paramilitary organizations, though many automatic designs are infamous for their use by civilians.


Health hazards

Firearm hazard is quite notable, with a significant impact on the health system. In 2001, for quantification purpose, it was estimated that the cost of fatalities and injuries was US$4700 million per year in Canada (US$170 per Canadian) and US$100,000 million per year in the USA (US$300 per American).


Death

From 1990 to 2015, global deaths from assault by firearm rose from 128,000 to 173,000, however this represents a drop in rate from 2.41/100,000 to 2.35/100,000, as world population has increased by more than two billion.. Linked to a
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where it states that the figures are for July 1 of the given year.
Additionally, there were 32,000 unintentional firearm global deaths in 2015. In 2017, there were 39,773 gun-related deaths in the United States; over 60% were suicides from firearms. Firearms are the second leading mechanism of injury deaths after Transportation safety in the United States, motor vehicle accidents. In the 52 high- and middle-income countries, with a combined population of 1,400 million and not engaged in civil conflict, fatalities due to firearm injuries were estimated at 115,000 people per annum, in the 1990shttp://whqlibdoc.who.int/hq/2001/WHO_NMH_VIP_01.1.pdf?ua=1 In those 52 countries, firearm is the first method used for homicide (two thirds) but only the second method for suicide (20%) To prevent unintentional injury, gun safety training includes education on proper firearm storage and firearm-handling etiquette.


Injury

Based on US data, it is estimated that three people are injured for one killed.


Noise

A common hazard of repeated firearm use is noise-induced hearing loss (NIHL). NIHL can result from long-term exposure to noise or from high intensity impact noises such as gunshots. Individuals who shoot guns often have a characteristic pattern of hearing loss referred to as "shooters ear". They often have a high frequency loss with better hearing in the low frequencies and one ear is typically worse than the other. The ear on the side the shooter is holding the gun will receive protection from the sound wave from the shoulder while the other ear remains unprotected and more susceptible to the full impact of the sound wave. The intensity of a gunshot does vary; lower caliber guns are typically on the softer side while higher caliber guns are often louder. The intensity of a gunshot though typically ranges from 140 dB to 175 dB. Indoor shooting also causes loud reverberations which can also be as damaging as the actual gunshot itself. According to the National Institute on Deafness and Other Communication Disorders, noise above 85 dB can begin to cause hearing loss. While many sounds cause damage over time, at the intensity level of a gunshot (140 dB or louder), damage to the ear can occur instantly. Shooters use custom hearing protection such as electronic type hearing protection for hunters which can amplify soft sounds like leaves crunching while reducing the intensity of the gunshot and custom hearing protection for skeet shooting. Even with hearing protection, due to the high intensity of the noise guns produce shooters still develop hearing loss over time.


Legal definitions

Firearms include a variety of ranged weapons and there is no agreed-upon definition. For instance English language laws of big legal entities such as the United States, India the European Union and Canada use different definitions. Other English language definitions are provided by international treaties.


United States

In the United States of America, United States, under 26 USCA § 861 (a), the term ‘‘firearm’’ means According to the US Bureau of Alcohol, Tobacco, Firearms and Explosives, if gas pressurization is achieved through ''mechanical'' gas compression rather than through chemical propellant combustion, then the device is technically an air gun, not a firearm.US Federal Govt
does not consider an air gun to be a firearm and does not regulate airguns as firearms


India

In India, the arms act, 1959, provides a definition of firearms where "firearms" means arms of any description designed or adapted to discharge a projectile or projectiles of any kind by the action of any explosive or other forms of energy, and includes:


European Union

In the European Union, a European Directive amended by EU directive 2017/853 set minimum standards regarding civilian firearms acquisition and possession that EU Member States must implement into their national legal systems. In this context, since 2017, firearms are considered as ''any portable barrelled weapon that expels, is designed to expel or may be converted to expel a shot, bullet or projectile by the action of a combustible propellant''. , recital. For legal reasons, objects can be considered as a firearm if they have the appearance of a firearm or are made in a way which makes it possible to convert them to a firearm. Member states may be allowed to exclude from their gun control law items such as antique weapons, or specific purposes items which can only be used for that sole purpose.


Canada

In Canada, firearms are defined by the Criminal Code:


Australia

Australia has a definition of firearms in its 1996 legal act:


South Africa

In South Africa, Firearms Control Act [No. 60 of 2000] defines firearm since June 2001, with a 2006 amendment of the definition:


International treaties

An inter-American convention defines firearms as: An Protocol against the Illicit Manufacturing of and Trafficking in Firearms, international UN protocol on firearms considers that


See also


References


Sources

* . * * * * {{Authority control Firearms, Weapons Projectile weapons Chinese inventions Gunpowder