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A gun is a
ranged weapon A ranged weapon is any weapon that can engage targets beyond hand-to-hand distance, i.e. at distances greater than the physical reach of the user holding the weapon itself. The act of using such a weapon is also known as shooting. It is someti ...
designed to use a shooting tube ( gun barrel) to launch
projectile A projectile is an object that is propelled by the application of an external force and then moves freely under the influence of gravity and air resistance. Although any objects in motion through space are projectiles, they are commonly found in ...
s. The projectiles are typically solid, but can also be pressurized
liquid A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, it is one of the four fundamental states of matter (the others being solid, gas, a ...
(e.g. in water guns/ cannons, spray guns for painting or pressure washing, projected water disruptors, and technically also
flamethrower A flamethrower is a ranged incendiary device designed to project a controllable jet of fire. First deployed by the Byzantine Empire in the 7th century AD, flamethrowers saw use in modern times during World War I, and more widely in World ...
s), gas (e.g. light-gas gun) or even charged particles (e.g. plasma gun). Solid projectiles may be free-flying (as with
bullets A bullet is a kinetic projectile, a component of firearm ammunition that is shot from a gun barrel. Bullets are made of a variety of materials, such as copper, lead, steel, polymer, rubber and even wax. Bullets are made in various shapes and con ...
and
artillery shell A shell, in a military context, is a projectile whose payload contains an explosive, incendiary, or other chemical filling. Originally it was called a bombshell, but "shell" has come to be unambiguous in a military context. Modern usage ...
s) or tethered (as with
Taser gun A taser is an electroshock weapon used to incapacitate people, allowing them to be approached and handled in an unresisting and thus safe manner. It is sold by Axon, formerly TASER International. It fires two small barbed darts intended to ...
s, spearguns and harpoon guns). A large-
caliber In guns, particularly firearms, caliber (or calibre; sometimes abbreviated as "cal") is the specified nominal internal diameter of the gun barrel Gauge (firearms) , bore – regardless of how or where the bore is measured and whether the f ...
gun is also called a '' cannon''. The means of projectile propulsion vary according to designs, but are traditionally effected
pneumatic Pneumatics (from Greek ‘wind, breath’) is a branch of engineering that makes use of gas or pressurized air. Pneumatic systems used in Industrial sector, industry are commonly powered by compressed air or compressed inert gases. A central ...
ally by a high
gas pressure In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas as if it alone occupied the entire volume of the original mixture at the same temperature. The total pressure of an ideal gas ...
contained within the barrel tube, produced either through the rapid
exothermic In thermodynamics, an exothermic process () is a thermodynamic process or reaction that releases energy from the system to its surroundings, usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e ...
combustion of
propellant A propellant (or propellent) is a mass that is expelled or expanded in such a way as to create a thrust or other motive force in accordance with Newton's third law of motion, and "propel" a vehicle, projectile, or fluid payload. In vehicles, the e ...
s (as with
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 10th-century China, when bamboo tubes ...
s), or by mechanical compression (as with
air gun An air gun or airgun is a gun that fires projectiles pneumatically with compressed air or other gases that are mechanically pressurized ''without'' involving any chemical reactions, in contrast to a firearm, which pressurizes gases ''chemica ...
s). The high-pressure gas is introduced behind the projectile, pushing and accelerating it down the length of the tube, imparting sufficient launch velocity to sustain its further travel towards the target once the propelling gas ceases acting upon it after it exits the muzzle. Alternatively, new-concept
linear motor A linear motor is an electric motor that has had its stator and rotor "unrolled", thus, instead of producing a torque (rotation), it produces a linear force along its length. However, linear motors are not necessarily straight. Characteristicall ...
weapons may employ an
electromagnetic field An electromagnetic field (also EM field or EMF) is a classical (i.e. non-quantum) field produced by (stationary or moving) electric charges. It is the field described by classical electrodynamics (a classical field theory) and is the classical c ...
to achieve acceleration, in which case the barrel may be substituted by guide rails (as in railguns) or wrapped with magnetic coils (as in coilguns). The first devices identified as guns or proto-guns appeared in
China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...
from around AD 1000. By the end of the 13th century, they had become "true guns," metal barrel firearms that fired single projectiles which occluded the barrel. Gunpowder and gun technology spread throughout Eurasia during the 14th century.


Etymology and terminology

The origin of the English word ''gun'' is considered to derive from the name given to a particular historical weapon. ''Domina Gunilda'' was the name given to a remarkably large ballista, a mechanical bolt throwing weapon of enormous size, mounted at Windsor Castle during the 14th century. This name in turn may have derived from the Old Norse woman's proper name ''Gunnhildr'' which combines two Norse words referring to battle. "Gunnildr", which means "War-sword", was often shortened to "Gunna". The earliest recorded use of the term "gonne" was in a Latin document circa 1339. Other names for guns during this era were "schioppi" (Italian translation-"thunderers"), and "donrebusse" (Dutch translation-"thunder gun") which was incorporated into the English language as "blunderbuss". Artillerymen were often referred to as "gonners" and "artillers" "Hand gun" was first used in 1373 in reference to the handle of guns.


Definition

According to the
Merriam-Webster Merriam-Webster, Inc. is an American company that publishes reference books and is especially known for its dictionaries. It is the oldest dictionary publisher in the United States. In 1831, George and Charles Merriam founded the company as ...
dictionary, a gun could mean "a piece of ordnance usually with high muzzle velocity and comparatively flat trajectory," " a portable firearm," or "a device that throws a projectile." Gunpowder and firearm historian Kenneth Chase defines "firearms" and "guns" in his ''Firearms: A Global History to 1700'' as "gunpowder weapons that use the explosive force of the gunpowder to propel a projectile from a tube: cannons, muskets, and pistols are typical examples."


True gun

According to
Tonio Andrade Tonio Adam Andrade (born 1968) is an historian of East Asian history and the history of East Asian trading networks. Bibliography * ''Commerce, Culture, and Conflict: Taiwan Under European Rule, 1624–1662''. Yale University Press, 2000. * ''H ...
, a historian of gunpowder technology, a "true gun" is defined as a firearm which shoots a bullet that fits the barrel as opposed to one which does not, such as the shrapnel shooting fire lance. As such, the fire lance, which appeared between the 10th and 12th centuries AD, as well as other early metal barrel gunpowder weapons have been described as "proto-guns" Joseph Needham defined a type of firearm known as the "eruptor," which he described as a cross between a fire lance and a gun, as a "proto-gun" for the same reason. He defined a fully developed firearm, a "true gun," as possessing three basic features: a metal barrel, gunpowder with high nitrate content, and a projectile that occluded the barrel. The "true gun" appears to have emerged in late 1200s China, around 300 years after the appearance of the fire lance. Although the term "gun" postdates the invention of firearms, historians have applied it to the earliest firearms such as the Heilongjiang hand cannon of 1288 or the vase shaped European cannon of 1326.


Classic gun

Historians consider firearms to have reached the form of a "classic gun" in the 1480s, which persisted until the mid-18th century. This "classic" form displayed longer, lighter, more efficient, and more accurate design compared to its predecessors only 30 years prior. However this "classic" design changed very little for almost 300 years and cannons of the 1480s show little difference and surprising similarity with cannons later in the 1750s. This 300-year period during which the classic gun dominated gives it its moniker. The "classic gun" has also been described as the "modern ordnance synthesis."


History


Proto-gun

Gunpowder was invented in China during the 9th century. The first firearm was the fire lance, which appeared in China between the 10–12th centuries. It was depicted in a silk painting dated to the mid-10th but textual evidence of its use does not appear until 1132, describing the siege of De'an. It consisted of a bamboo tube of gunpowder tied to a spear or other polearm. By the late 1100s, ingredients such as pieces of shrapnel like porcelain shards or small iron pellets were added to the tube so that they would be blown out with the gunpowder. It was relatively short ranged and had a range of roughly 3 meters by the early 13th century. This fire lance is considered by some historians to be a "proto-gun" because its projectiles did not occlude the barrel. There was also another "proto-gun" called the eruptor, according to Joseph Needham, which did not have a lance but still did not shoot projectiles which occluded the barrel.


Transition to true guns

In due course, the proportion of saltpeter in the propellant was increased to maximise its explosive power. To better withstand that explosive power, the paper and bamboo of which fire-lance barrels were originally made came to be replaced by metal. And to take full advantage of that power, the shrapnel came to be replaced by projectiles whose size and shape filled the barrel more closely. Fire lance barrels made of metal appeared by 1276. Earlier in 1259 a pellet wad that filled the barrel was recorded to have been used as a fire lance projectile, making it the first recorded bullet in history. With this, the three basic features of a gun were put in place: a barrel made of metal, high-
nitrate Nitrate is a polyatomic ion A polyatomic ion, also known as a molecular ion, is a covalent bonded set of two or more atoms, or of a metal complex, that can be considered to behave as a single unit and that has a net charge that is not zer ...
gunpowder, and a projectile which totally occludes the muzzle so that the powder charge exerts its full potential in propellant effect. The metal barrel fire lances began to be used without the lance and became guns by the late 13th century. Guns such as the hand cannon were being used in the Yuan dynasty by the 1280s. Surviving cannons such as the Heilongjiang hand cannon and the Xanadu Gun have been found dating to the late 13th century and possibly earlier in the early 13th century. In 1287, the Yuan dynasty deployed Jurchen troops with hand cannons to put down a rebellion by the Mongol prince Nayan. The '' History of Yuan'' records that the cannons of Li Ting's soldiers "caused great damage" and created "such confusion that the enemy soldiers attacked and killed each other." The hand cannons were used again in the beginning of 1288. Li Ting's "gun-soldiers" or ''chongzu'' () carried the hand cannons "on their backs". The passage on the 1288 battle is also the first to use the name ''chong'' () with the metal
radical Radical may refer to: Politics and ideology Politics *Radical politics, the political intent of fundamental societal change *Radicalism (historical), the Radical Movement that began in late 18th century Britain and spread to continental Europe and ...
''jin'' () for metal-barrel firearms. ''Chong'' was used instead of the earlier and more ambiguous term ''huo tong'' (fire tube; ), which may refer to the tubes of fire lances, proto-cannons, or signal flares. Hand cannons may have been used in the Mongol invasions of Japan. Japanese descriptions of the invasions mention iron and bamboo ''pao'' causing "light and fire" and emitting 2–3,000 iron bullets. The ''Nihon Kokujokushi'', written around 1300, mentions ''huo tong'' (fire tubes) at the Battle of Tsushima in 1274 and the second coastal assault led by Holdon in 1281. The ''Hachiman Gudoukun'' of 1360 mentions iron ''pao'' "which caused a flash of light and a loud noise when fired." The ''Taiheki'' of 1370 mentions "iron ''pao'' shaped like a bell."


Spread

The exact nature of the spread of firearms and its route is uncertain. One theory is that gunpowder and cannons arrived in Europe via the
Silk Road The Silk Road () was a network of Eurasian trade routes active from the second century BCE until the mid-15th century. Spanning over 6,400 kilometers (4,000 miles), it played a central role in facilitating economic, cultural, political, and reli ...
through the Middle East. Hasan al-Rammah had already written about fire lances in the 13th century, so proto-guns were known in the Middle East at that point. Another theory is that it was brought to Europe during the
Mongol invasion The Mongol invasions and conquests took place during the 13th and 14th centuries, creating history's largest contiguous empire: the Mongol Empire ( 1206- 1368), which by 1300 covered large parts of Eurasia. Historians regard the Mongol devastati ...
in the first half of the 13th century. The earliest depiction of a cannon in Europe dates to 1326 and evidence of firearm production can be found in the following year. The first recorded use of gunpowder weapons in Europe was in 1331 when two mounted German knights attacked Cividale del Friuli with gunpowder weapons of some sort. By 1338 hand cannons were in widespread use in France. English
Privy Wardrobe The King's Wardrobe, together with the Chamber, made up the personal part of medieval English government known as the King's household. Originally the room where the king's clothes, armour, and treasure were stored, the term was expanded to descr ...
accounts list "ribaldis", a type of cannon, in the 1340s, and siege guns were used by the English at
Calais Calais ( , , traditionally , ) is a port city in the Pas-de-Calais department, of which it is a subprefecture. Although Calais is by far the largest city in Pas-de-Calais, the department's prefecture is its third-largest city of Arras. Th ...
in 1346. Early guns and the men who used them were often associated with the devil and the gunner's craft was considered a black art, a point reinforced by the smell of
sulfur Sulfur (or sulphur in British English) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic. Under normal conditions, sulfur atoms form cyclic octatomic molecules with a chemical formula ...
on battlefields created from the firing of guns along with the muzzle blast and accompanying flash. Around the late 14th century in Europe, smaller and portable hand-held cannons were developed, creating in effect the first smooth-bore personal firearm. In the late 15th century the Ottoman empire used firearms as part of its regular infantry. In the Middle East, the Arabs seem to have used the hand cannon to some degree during the 14th century. Cannons are attested to in India starting from 1366. The
Joseon Joseon (; ; Middle Korean: 됴ᇢ〯션〮 Dyǒw syéon or 됴ᇢ〯션〯 Dyǒw syěon), officially the Great Joseon (; ), was the last dynastic kingdom of Korea, lasting just over 500 years. It was founded by Yi Seong-gye in July 1392 and re ...
kingdom in Korea learned how to produce gunpowder from China by 1372 and started producing cannons by 1377. In Southeast Asia, Đại Việt soldiers used hand cannons at the very latest by 1390 when they employed them in killing
Champa Champa (Cham: ꨌꩌꨛꨩ; km, ចាម្ប៉ា; vi, Chiêm Thành or ) were a collection of independent Cham polities that extended across the coast of what is contemporary central and southern Vietnam from approximately the 2nd cen ...
king Che Bong Nga. Java was confirmed to use hand cannon in 1413 during Zheng He's voyage. Japan knew of gunpowder due to the Mongol invasions during the 13th century, but did not acquire a cannon until a monk took one back to Japan from China in 1510, and guns were not produced until 1543, when the Portuguese introduced matchlocks which were known as tanegashima to the Japanese. Gunpowder technology entered Java in the Mongol invasion of Java (1293 A.D.).Schlegel, Gustaaf (1902). "On the Invention and Use of Fire-Arms and Gunpowder in China, Prior to the Arrival of European". ''T'oung Pao''. 3: 1–11.Reid, Anthony (1993). ''Southeast Asia in the Age of Commerce, 1450-1680. Volume Two: Expansion and Crisis''. New Haven and London: Yale University Press.
Majapahit Majapahit ( jv, ꦩꦗꦥꦲꦶꦠ꧀; ), also known as Wilwatikta ( jv, ꦮꦶꦭ꧀ꦮꦠꦶꦏ꧀ꦠ; ), was a Javanese people, Javanese Hinduism, Hindu-Buddhism, Buddhist thalassocracy, thalassocratic empire in Southeast Asia that was ba ...
under ''Mahapatih'' (prime minister) Gajah Mada utilized gunpowder technology obtained from the Yuan dynasty for use in the naval fleet. During the following years, the Majapahit army have begun producing cannons known as cetbang. Early cetbang (also called Eastern-style cetbang) resembled Chinese cannons and hand cannons. Eastern-style cetbangs were mostly made of bronze and were front-loaded cannons. It fires arrow-like projectiles, but round bullets and co-viative projectiles can also be used. These arrows can be solid-tipped without explosives, or with explosives and incendiary materials placed behind the tip. Near the rear, there is a combustion chamber or room, which refers to the bulging part near the rear of the gun, where the gunpowder is placed. The cetbang is mounted on a fixed mount, or as a hand cannon mounted on the end of a pole. There is a tube-like section on the back of the cannon. In the hand cannon type cetbang, this tube is used as a place to stick poles.Averoes, Muhammad (2020). Antara Cerita dan Sejarah: Meriam Cetbang Majapahit. ''Jurnal Sejarah'', 3(2), 89 - 100.


Arquebus and musket

The arquebus was a firearm that appeared in Europe and the Ottoman Empire in the early 15th century. Its name is derived from the German word ''Hackenbüchse''. It originally described a hand cannon with a lug or hook on the underside for stabilizing the weapon, usually on defensive fortifications. In the early 1500s, heavier variants known as "
musket A musket is a muzzle-loaded long gun that appeared as a smoothbore weapon in the early 16th century, at first as a heavier variant of the arquebus, capable of penetrating plate armour. By the mid-16th century, this type of musket gradually d ...
s" that were fired from resting Y-shaped supports appeared. The musket was able to penetrate heavy armor, and as a result armor declined, which also made the heavy musket obsolete. Although there is relatively little to no difference in design between arquebus and musket except in size and strength, it was the term ''musket'' which remained in use up into the 1800s. It may not be completely inaccurate to suggest that the musket was in its fabrication simply a larger arquebus. At least on one occasion the musket and arquebus have been used interchangeably to refer to the same weapon, and even referred to as an "arquebus musket." A Habsburg commander in the mid-1560s once referred to muskets as "double arquebuses." A shoulder stock was added to the arquebus around 1470 and the matchlock mechanism sometime before 1475. The matchlock arquebus was the first firearm equipped with a trigger mechanism and the first portable shoulder-arms firearm. Before the matchlock, handheld firearms were fired from the chest, tucked under one arm, while the other arm maneuvered a hot pricker to the touch hole to ignite the gunpowder. The Ottomans may have used arquebuses as early as the first half of the 15th century during the
Ottoman–Hungarian wars The Ottoman–Hungarian Wars were a series of battles between the Ottoman Empire and the medieval Kingdom of Hungary. Following the Byzantine Civil War, the Ottoman capture of Gallipoli, and the decisive Battle of Kosovo, the Ottoman Empire wa ...
of 1443–1444. The arquebus was used in substantial numbers during the reign of king Matthias Corvinus of Hungary (r. 1458–1490). Arquebuses were used by 1472 by the Spanish and Portuguese at Zamora. Likewise, the Castilians used arquebuses as well in 1476. Later, a larger arquebus known as a musket was used for breaching heavy armor, but this declined along with heavy armor. Matchlock firearms continued to be called musket. They were used throughout Asia by the mid-1500s.


Transition to classic guns

Guns reached their "classic" form in the 1480s. The "classic gun" is so called because of the long duration of its design, which was longer, lighter, more efficient, and more accurate compared to its predecessors 30 years prior. The design persisted for nearly 300 years and cannons of the 1480s show little variation from as well as surprising similarity with cannons three centuries later in the 1750s. This 300-year period during which the classic gun dominated gives it its moniker. The classic gun differed from older generations of firearms through an assortment of improvements. Their longer length-to-bore ratio imparted more energy into the shot, enabling the projectile to shoot further. They were also lighter since the barrel walls were thinner, allowing faster dissipation of heat. They no longer needed the help of a wooden plug to load since they offered a tighter fit between projectile and barrel, further increasing the accuracy of firearms – and were deadlier due to developments such as gunpowder corning and iron shot.


Modern guns

Several developments in the 19th century led to the development of modern guns. In 1815,
Joshua Shaw Joshua Shaw (1776–1860) was an English American artist and inventor. Early life Joshua Shaw was born in Billingborough, Lincolnshire, England in 1776 and was orphaned at the age of 7. To survive he worked for a local farmer as a bird scare ...
invented percussion caps, which replaced the flintlock trigger system. The new percussion caps allowed guns to shoot reliably in any weather condition. In 1835, Casimir Lefaucheux invented the first practical
breech loading A breechloader is a firearm in which the user loads the ammunition (cartridge or shell) via the rear (breech) end of its barrel, as opposed to a muzzleloader, which loads ammunition via the front ( muzzle). Modern firearms are generally bre ...
firearm with a cartridge. The new cartridge contained a conical bullet, a cardboard powder tube, and a copper base that incorporated a primer pellet.


Rifles

While
rifle A rifle is a long-barreled firearm designed for accurate shooting, with a barrel that has a helical pattern of grooves ( rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with ...
d guns did exist prior to the 19th century in the form of grooves cut into the interior of a barrel, these were considered specialist weapons and limited in number. The rate of fire of handheld guns began to increase drastically. In 1836, Johann Nicolaus von Dreyse invented the Dreyse needle gun, a breech-loading rifle which increased the rate of fire to six times that of muzzle loading weapons. In 1854, Volcanic Repeating Arms produced a rifle with a self-contained cartridge. In 1849, Claude-Étienne Minié invented the Minié ball, the first projectile that could easily slide down a rifled barrel, which made rifles a viable military firearm, ending the smoothbore
musket A musket is a muzzle-loaded long gun that appeared as a smoothbore weapon in the early 16th century, at first as a heavier variant of the arquebus, capable of penetrating plate armour. By the mid-16th century, this type of musket gradually d ...
era. Rifles were deployed during the Crimean War with resounding success and proved vastly superior to smoothbore muskets. In 1860,
Benjamin Tyler Henry Benjamin Tyler Henry (March 22, 1821 – June 8, 1898) was an American gunsmith and manufacturer. He was the inventor of the Henry rifle, the first reliable lever-action repeating rifle. Henry was born in Claremont, New Hampshire in 1821. ...
created the Henry rifle, the first reliable
repeating rifle A repeating rifle is a single- barreled rifle capable of repeated discharges between each ammunition reloads. This is typically achieved by having multiple cartridges stored in a magazine (within or attached to the gun) and then fed individually i ...
. An improved version of the Henry rifle was developed by Winchester Repeating Arms Company in 1873, known as the Model 1873 Winchester rifle. Smokeless powder was invented in 1880 and began replacing gunpowder, which came to be known as black powder. By the start of the 20th century, smokeless powder was adopted throughout the world and black powder, what was previously known as gunpowder, was relegated to hobbyist usage.


Machine guns

In 1861, Richard Jordan Gatling invented the
Gatling gun The Gatling gun is a rapid-firing multiple-barrel firearm invented in 1861 by Richard Jordan Gatling. It is an early machine gun and a forerunner of the modern electric motor-driven rotary cannon. The Gatling gun's operation centered on a cyc ...
, the first successful machine gun, capable of firing 200 gunpowder cartridges in a minute. It was fielded by the Union forces during the American Civil War in the 1860s. In 1884, Hiram Maxim invented the Maxim gun, the first single-barreled machine gun. The world's first
submachine gun A submachine gun (SMG) is a magazine-fed, automatic carbine designed to fire handgun cartridges. The term "submachine gun" was coined by John T. Thompson, the inventor of the Thompson submachine gun, to describe its design concept as an autom ...
(a fully automatic firearm which fires pistol cartridges) able to be maneuvered by a single soldier is the MP 18.1, invented by Theodor Bergmann. It was introduced into service in 1918 by the German Army during World War I as the primary weapon of the
Stosstruppen Stormtroopers (german: Sturmtruppen or ''Stoßtruppen'') were specialist soldiers of the German Army. In the last years of World War I, ''Stoßtruppen'' ("shock troopers" or "shove troopers") were trained to use infiltration tactics – part of ...
(assault groups specialized in trench combat). In civilian use, the captive bolt pistol is used in agriculture to humanely stun farm animals for slaughter. The first assault rifle was introduced during World War II by the Germans, known as the
StG44 The StG 44 (abbreviation of Sturmgewehr 44, "assault rifle 44") is a German assault rifle developed during World War II by Hugo Schmeisser. It is also known by its early designations as the MP 43 and MP 44 (''Maschinenpistole 43'' and ''44''). ...
. It was the first firearm to bridge the gap between long range rifles, machine guns, and short range submachine guns. Since the mid-20th century, guns that fire beams of energy rather than solid projectiles have been developed, and also guns that can be fired by means other than the use of gunpowder.


Operating principle

Most guns use compressed gas confined by the barrel to propel the bullet up to high speed, though devices operating in other ways are sometimes called guns. In firearms the high-pressure gas is generated by combustion, usually of gunpowder. This principle is similar to that of internal combustion engines, except that the bullet leaves the barrel, while the piston transfers its motion to other parts and returns down the cylinder. As in an internal combustion engine, the combustion propagates by
deflagration Deflagration (Lat: ''de + flagrare'', "to burn down") is subsonic combustion in which a pre-mixed flame propagates through a mixture of fuel and oxidizer. Deflagrations can only occur in pre-mixed fuels. Most fires found in daily life are diffu ...
rather than by detonation, and the optimal gunpowder, like the optimal motor fuel, is resistant to detonation. This is because much of the energy generated in detonation is in the form of a shock wave, which can propagate from the gas to the solid structure and heat or damage the structure, rather than staying as heat to propel the piston or bullet. The shock wave at such high temperature and pressure is much faster than that of any bullet, and would leave the gun as sound either through the barrel or the bullet itself rather than contributing to the bullet's velocity.


Components


Barrel

Barrel types include
rifled In firearms, rifling is machining helical grooves into the internal (bore) surface of a gun's barrel for the purpose of exerting torque and thus imparting a spin to a projectile around its longitudinal axis during shooting to stabilize the proj ...
—a series of spiraled grooves or angles within the barrel—when the projectile requires an induced spin to stabilize it, and smoothbore when the projectile is stabilized by other means or rifling is undesired or unnecessary. Typically, interior barrel diameter and the associated projectile size is a means to identify gun variations. Bore diameter is reported in several ways. The more conventional measure is reporting the interior diameter (bore) of the barrel in decimal fractions of the inch or in millimetres. Some guns—such as
shotgun A shotgun (also known as a scattergun, or historically as a fowling piece) is a long gun, long-barreled firearm designed to shoot a straight-walled cartridge (firearms), cartridge known as a shotshell, which usually discharges numerous small p ...
s—report the weapon's gauge (which is the number of shot pellets having the same diameter as the bore produced from one English pound (454g) of lead) or—as in some British ordnance—the weight of the weapon's usual projectile.


Projectile

A gun projectile may be a simple, single-piece item like a bullet, a casing containing a payload like a shotshell or explosive shell, or complex projectile like a sub-caliber projectile and sabot. The propellant may be air, an explosive solid, or an explosive liquid. Some variations like the
Gyrojet The Gyrojet is a family of unique firearms developed in the 1960s named for the method of gyroscopically stabilizing its projectiles. Rather than inert bullets, Gyrojets fire small rockets called Microjets which have little recoil and do not req ...
and certain other types combine the projectile and propellant into a single item.


Types


Military

* Long gun ** Arquebus **
Blunderbuss The blunderbuss is a firearm with a short, large caliber barrel which is flared at the muzzle and frequently throughout the entire bore, and used with shot and other projectiles of relevant quantity or caliber. The blunderbuss is commonly consid ...
**
Musket A musket is a muzzle-loaded long gun that appeared as a smoothbore weapon in the early 16th century, at first as a heavier variant of the arquebus, capable of penetrating plate armour. By the mid-16th century, this type of musket gradually d ...
*** Musketoon ***
Wall gun The wall gun or wall piece was a type of smoothbore firearm used in the 16th through 18th centuries by defending forces to break the advance of enemy troops. Essentially, it was a scaled-up version of the army's standard infantry musket, operating ...
***
Grenade launcher A grenade launcher is a weapon that fires a specially-designed large-caliber projectile, often with an explosive, smoke or gas warhead. Today, the term generally refers to a class of dedicated firearms firing unitary grenade cartridges. The mos ...
**
Submachine gun A submachine gun (SMG) is a magazine-fed, automatic carbine designed to fire handgun cartridges. The term "submachine gun" was coined by John T. Thompson, the inventor of the Thompson submachine gun, to describe its design concept as an autom ...
*** Personal defense weapon **
Rifle A rifle is a long-barreled firearm designed for accurate shooting, with a barrel that has a helical pattern of grooves ( rifling) cut into the bore wall. In keeping with their focus on accuracy, rifles are typically designed to be held with ...
*** Lever-action rifle *** Bolt-action rifle *** Assault rifle ***
Battle rifle A battle rifle is a 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 (e.g. the S ...
*** Carbine *** Designated marksman rifle *** Service rifle ***
Sniper rifle A sniper rifle is a high-precision, long-range rifle. Requirements include accuracy, reliability, mobility, concealment and optics for anti-personnel, anti-materiel and surveillance uses of the military sniper. The modern sniper rifle is a por ...
**
Shotgun A shotgun (also known as a scattergun, or historically as a fowling piece) is a long gun, long-barreled firearm designed to shoot a straight-walled cartridge (firearms), cartridge known as a shotshell, which usually discharges numerous small p ...
*** Combat shotgun *** Semi-automatic shotgun *** Automatic shotgun


Handguns

*
Handgun A handgun is a short- barrelled gun, typically a firearm, that is designed to be usable with only one hand. It is distinguished from a long gun (i.e. rifle, shotgun or machine gun, etc.), which needs to be held by both hands and also braced ...
** Derringer **
Pistol A pistol is a handgun, more specifically one with the chamber integral to its gun barrel, though in common usage the two terms are often used interchangeably. The English word was introduced in , when early handguns were produced in Europe, an ...
*** Machine pistol *** Service pistol **
Revolver A revolver (also called a wheel gun) is a repeating handgun that has at least one barrel and uses a revolving cylinder containing multiple chambers (each holding a single cartridge) for firing. Because most revolver models hold up to six roun ...
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Service revolver A service pistol, also known as a personal weapon or an ordnance weapon, is any handgun issued to regular military personnel or law enforcement officers. Typically, service pistols are revolvers or semi-automatic pistols issued to officers, ...


Hunting

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Air gun An air gun or airgun is a gun that fires projectiles pneumatically with compressed air or other gases that are mechanically pressurized ''without'' involving any chemical reactions, in contrast to a firearm, which pressurizes gases ''chemica ...
** BB gun * Elephant gun * Express rifle *
Rimfire rifle Rimfire ammunition is a type of firearm metallic cartridge whose primer is located within a hollow circumferential rim protruding from the base of its casing. When fired, the gun's firing pin will strike and crush the rim against the edge ...
* Speargun *
Varmint rifle Varmint rifle is an American English term for a small-caliber precision firearm or high-powered airgun primarily used for both varmint hunting (the elimination of outdoor animals which harass properties) and pest control (the eradication of indoor ...


Machine guns

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Gatling gun The Gatling gun is a rapid-firing multiple-barrel firearm invented in 1861 by Richard Jordan Gatling. It is an early machine gun and a forerunner of the modern electric motor-driven rotary cannon. The Gatling gun's operation centered on a cyc ...
** Minigun * Nordenfelt gun * Metal Storm * Mitrailleuse *
Submachine gun A submachine gun (SMG) is a magazine-fed, automatic carbine designed to fire handgun cartridges. The term "submachine gun" was coined by John T. Thompson, the inventor of the Thompson submachine gun, to describe its design concept as an autom ...
** Machine pistol * Machine gun ** General-purpose machine gun ** Light machine gun *** Squad Automatic Weapon ***
Infantry Automatic Rifle The M27 Infantry Automatic Rifle (IAR) is a 5.56mm select-fire assault rifle, based on the HK416 by Heckler & Koch. It is used by the United States Marine Corps (USMC) and is intended to be issued to all infantry riflemen as well as automatic ri ...
** Medium machine gun ** Heavy machine gun


Autocannon

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Autocannon An autocannon, automatic cannon or machine cannon is a fully automatic gun that is capable of rapid-firing large-caliber ( or more) armour-piercing, explosive or incendiary shells, as opposed to the smaller-caliber kinetic projectiles (bull ...
* Chain gun * Revolver cannon


Artillery

* Artillery gun ** Cannon **
Carronade A carronade is a short, smoothbore, cast-iron cannon which was used by the Royal Navy. It was first produced by the Carron Company, an ironworks in Falkirk, Scotland, and was used from the mid-18th century to the mid-19th century. Its main func ...
** Falconet **
Field gun A field gun is a field artillery piece. Originally the term referred to smaller guns that could accompany a field army on the march, that when in combat could be moved about the battlefield in response to changing circumstances ( field artille ...
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Howitzer A howitzer () is a long- ranged weapon, falling between a cannon (also known as an artillery gun in the United States), which fires shells at flat trajectories, and a mortar, which fires at high angles of ascent and descent. Howitzers, like ot ...


Tank

* Tank gun


Rescue equipment

* Flare gun *
Lyle gun A Lyle gun was a line thrower powered by a short-barrelled cannon. It was invented by Captain David A. Lyle, US Army, a graduate of West Point and the Massachusetts Institute of Technology and were used from the late 19th century to 1952, when ...


Training and entertainment

* Airsoft gun * Cap gun * Drill Purpose Rifle *
Nerf gun A Nerf Blaster is a toy gun made by Hasbro that fires foam darts, discs, or foam balls. The term "Nerf gun" or the more common term “nerf blaster” are often used to describe the toy. Nerf blasters are manufactured in multiple forms; the fi ...
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Paintball gun A paintball marker, also known as a paintball gun, paint gun, or simply marker, is an air gun used in the shooting sport of paintball, and the main piece of paintball equipment. Paintball markers use compressed gas, such as carbon dioxide (CO2) ...
* Potato cannon * Prop gun * Spud gun * Water gun


Energy

* Directed-energy weapon


See also

* Coilgun *
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 10th-century China, when bamboo tubes ...
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Gun control Gun control, or firearms regulation, is the set of laws or policies that regulate the manufacture, sale, transfer, possession, modification, or use of firearms by civilians. Most countries have a restrictive firearm guiding policy, with on ...
* Gun cultures * Gun ownership * Gun Quarter *
Gun safety Gun safety is the study and practice of using, transporting, storing and disposing of firearms and ammunition, including the training of gun users, the design of weapons, and formal and informal regulation of gun production, distribution, and ...
* Overview of gun laws by nation * Railgun *
Stun gun A stun gun is any weapon that incapacitates its target without killing. Tasers, tranquillizer guns, and mace (spray) are all types of stun guns. Subcategories of stun gun include the electroshock weapon, an incapacitating weapon that momentarily di ...


Notes


References

* * * * . * * * * * . * * . * * * . * * . * . * . * * * . * Hadden, R. Lee. 2005
"Confederate Boys and Peter Monkeys."
Armchair General. January 2005. Adapted from a talk given to the Geological Society of America on 25 March 2004. * * * * . * . * * . * . * * * * . * * * * * * * * * * * . * * * * * * * * * . * * . * * . * . * * . * * * * * * * * * Schmidtchen, Volker (1977a), "Riesengeschütze des 15. Jahrhunderts. Technische Höchstleistungen ihrer Zeit", ''Technikgeschichte'' 44 (2): 153–173 (153–157) * Schmidtchen, Volker (1977b), "Riesengeschütze des 15. Jahrhunderts. Technische Höchstleistungen ihrer Zeit", ''Technikgeschichte'' 44 (3): 213–237 (226–228) * . * * . * * * * * * * * * {{Authority control Firearms Projectile weapons Chinese inventions Gunpowder