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A semi-automatic pistol is a type of repeating single-
chamber Chamber or the chamber may refer to: In government and organizations * Chamber of commerce, an organization of business owners to promote commercial interests *Legislative chamber, in politics * Debate chamber, the space or room that houses delib ...
handgun ( pistol) that automatically cycles its
action Action may refer to: * Action (narrative), a literary mode * Action fiction, a type of genre fiction * Action game, a genre of video game Film * Action film, a genre of film * ''Action'' (1921 film), a film by John Ford * ''Action'' (1980 fil ...
to insert the subsequent
cartridge Cartridge may refer to: Objects * Cartridge (firearms), a type of modern ammunition * ROM cartridge, a removable component in an electronic device * Cartridge (respirator), a type of filter used in respirators Other uses * Cartridge (surname), a ...
into the
chamber Chamber or the chamber may refer to: In government and organizations * Chamber of commerce, an organization of business owners to promote commercial interests *Legislative chamber, in politics * Debate chamber, the space or room that houses delib ...
(self-loading), but requires manual actuation of the
trigger Trigger may refer to: Notable animals and people ;Mononym * Trigger (horse), owned by cowboy star Roy Rogers ;Nickname * Trigger Alpert (1916–2013), American jazz bassist * "Trigger Mike" Coppola (1900–1966), American gangster ;Surname * Bru ...
to actually discharge the following shot. As a result, only one round of ammunition is fired each time the trigger is pulled, as the pistol's
fire control group A trigger is a mechanism that actuates the function of a ranged weapon such as a firearm, airgun, crossbow, or speargun. The word may also be used to describe a switch that initiates the operation of other non-shooting devices such as a trap, ...
disconnects the trigger mechanism from the
firing pin A firing pin or striker is a part of the firing mechanism of a firearm that impacts the primer in the base of a cartridge and causes it to fire. In firearms terminology, a striker is a particular type of firing pin where a compressed spring ...
/ striker until the trigger has been released and reset. Additional terms sometimes used as synonyms for a semi-automatic pistol are self-loading pistol, autopistol, autoloading pistol, and automatic pistol (E.G.:
Automatic Colt Pistol Automatic Colt Pistol (ACP) denotes various John Moses Browning cartridge designs primarily used in Colt and Fabrique Nationale de Herstal semi-automatic pistols. All of these cartridges are straight-sided and appear similar. The .32 ACP, .38 ACP ...
). A semi-automatic pistol recycles part of the energy released by the propellant combustion to move its bolt, which is usually housed inside the
slide Slide or Slides may refer to: Places * Slide, California, former name of Fortuna, California Arts, entertainment, and media Music Albums * ''Slide'' (Lisa Germano album), 1998 * ''Slide'' (George Clanton album), 2018 *''Slide'', by Patrick Glees ...
. After a round of ammunition is fired, the spent cartridge casing is extracted and ejected as the slide/bolt moves rearwards under
recoil Recoil (often called knockback, kickback or simply kick) is the rearward thrust generated when a gun is being discharged. In technical terms, the recoil is a result of conservation of momentum, as according to Newton's third law the force r ...
, the hammer/striker is cocked by the slide/bolt movement, and a new round from the magazine is pushed into the chamber when the slide/bolt returns forward under
spring Spring(s) may refer to: Common uses * Spring (season) Spring, also known as springtime, is one of the four temperate seasons, succeeding winter and preceding summer. There are various technical definitions of spring, but local usage of ...
tension. This sets up the following shot, which is fired as soon as the trigger is pulled again. Most pistols use a short recoil operation to perform this, but some pistols use simple blowback or
gas operation Gas-operation is a system of operation used to provide energy to operate locked breech, autoloading firearms. In gas-operation, a portion of high-pressure gas from the cartridge being fired is used to power a mechanism to dispose of the spent ...
mechanisms. Most types of semi-automatic pistols rely on a removable
box magazine A magazine is an ammunition storage and feeding device for a repeating firearm, either integral within the gun (internal/fixed magazine) or externally attached (detachable magazine). The magazine functions by holding several cartridges with ...
to provide ammunition, which is usually inserted into the grip. However, some pistols are based on receiver-style designs similar to existing
semi-automatic rifle A semi-automatic rifle is an autoloading rifle that fires a single cartridge with each pull of the trigger, and uses part of the fired cartridge's energy to eject the case and load another cartridge into the chamber. For comparison, a bolt-a ...
s, and thus have the magazine inserted separately from the grip.


Terminology

The language surrounding "automatic", "semi-automatic", "self-loading", etc., often causes confusion due to differences in technical usage between different countries and differences in popular usage. For example, the term "automatic pistol" technically refers to a
fully automatic An automatic firearm is an auto-loading firearm that continuously chambers and fires rounds when the trigger mechanism is actuated. The action of an automatic firearm is capable of harvesting the excess energy released from a previous discha ...
machine pistol A machine pistol is an autoloading pistol capable of fully automatic fire. The term can also be used to describe a stockless handgun-style submachine gun. The term is a calque of ''Maschinenpistole'', the German word for submachine guns. Ma ...
, which is capable of continuously firing multiple rounds with a single pull of the trigger, although in popular American usage it is also used as a synonym for any self-loading pistol, the vast majority of which are semi-automatic. In colloquial usage, because machine pistols are very rare on the market, an "automatic pistol", a "semi-automatic pistol" or a "self-loading pistol" usually all imply a semi-automatic handgun that is fed by a removable magazine, which discharges one round for each trigger pull.


Operation

Semi-automatic pistols use one firing chamber that remains fixed in a constant linear position relative to the gun barrel. In contrast, although double-action revolvers can also be fired semiautomatically, their rounds are not fired from a single chamber, but rather are fired from each of the chambers that are rotated into linear alignment with the barrel's position in turn just prior for each shot fired. Typically, the first round is manually loaded into the chamber by pulling back and releasing the slide mechanism. After the trigger is pulled and the round is fired, the
recoil operation Recoil operation is an operating mechanism used to implement locked breech, autoloading firearms. Recoil operated firearms use the energy of recoil to cycle the action, as opposed to gas operation or blowback operation using the pressure of the p ...
of the handgun automatically extracts and ejects the shell casing and reloads the chamber. This mode of operation generally allows for faster reloading and storing a larger number of cartridges than a revolver. Some modern semi-automatic pistols are double-action only (DA or DAO); that is, once a round is chambered, each trigger pull cocks the hammer, striker, or firing pin, and additionally releases the same to fire a cartridge in one continuous motion. Each pull of the trigger on a DAO semi-automatic pistol requires the same amount of pressure. The
Kel-Tec P-32 The Kel-Tec P-32 is a sub-compact semi-automatic pistol using the short-recoil principle of operation that is chambered in .32 ACP. It was designed by George Kellgren. It is manufactured by Kel-Tec CNC Industries Inc., of Cocoa, Florida and was ...
is an example of a DAO action. DAO semi-automatic pistols are most generally recommended only in the smaller, self-defense, concealable pistols, rather than in target or hunting pistols. A notable exception is Glock-brand pistols which optimize preset triggers (similar to DAO), but the striker is partially cocked back as the slide closes. This allows for significantly shorter trigger pulls than DAO. The trigger spring can be replaced with a lighter one and paired with a low-strength sear connector resulting in lightened trigger pulls to improve a shooter's accuracy (like models G34 and G35). Standard modern semi-automatic pistols are usually double-action (DA), also sometimes known as double-action/single-action (DA/SA). In this design, the hammer or striker may be either thumb-cocked or activated by pulling the trigger when firing the first shot. The hammer or striker is recocked automatically during each firing cycle. In double-action pistols, the first pull of the trigger requires roughly twice as much pressure as subsequent firings, since the first pull of the trigger also cocks the hammer (if not already cocked by hand). The
Beretta 92F/FS The Beretta 92 (also Beretta 96 and Beretta 98) is a series of semi-automatic pistols designed and manufactured by Beretta of Italy. The Beretta 92 was designed in 1975, and production began in 1976. Many variants in several different calibers c ...
, a full-sized, service, semi-automatic pistol is an example of this style of action. A common mode of carry for DA semi-automatic pistols is with the magazine full, a round chambered, and the gun holstered and uncocked with the external safety unengaged or off. The Taurus PT145 is an example of a DA/SA weapon, as it has no decocker and thus has its striker primed from the moment of chambering and only enters double-action mode if a round fails to fire upon the pin's impact; at other times, it operates as a single-action striker-fired firearm. In contrast, a single-action (SA) semi-automatic pistol must be cocked by first operating the slide or bolt, or, if a round is already chambered, by cocking the hammer manually. The famed Colt
M1911 The M1911 (Colt 1911 or Colt Government) is a single-action, recoil-operated, semi-automatic pistol chambered for the .45 ACP cartridge. The pistol's formal U.S. military designation as of 1940 was ''Automatic Pistol, Caliber .45, M1911'' for th ...
is an example of this style of action. All SA semi-automatic pistols exhibit this feature and automatically cock the hammer when the slide is first "racked" to chamber a round. A round can also be manually inserted in the chamber with the slide locked back. Then the safety can be applied. It is generally not a good idea to load a round manually as this can cause excessive wear on the extractor as semi-automatic firearms were designed to have cartridges loaded from the bottom via the magazine.


Cocking modes

The normal mode of carrying an SA semi-automatic pistol is condition 1, popularly known as cocked and locked. Condition 1 (a term popularized by Jeff Cooper) refers to having the magazine full, a round chambered, the hammer fully cocked, and the thumb safety engaged or on, at least for right-handed users. For many single-action, semi-automatic pistols, this procedure works well only for right-handed users, as the thumb safety is located on the left side of the pistol and is easily accessible only for those who are holding the pistol in the right hand. Many modern SA semi-automatic pistols have had their safety mechanisms redesigned to provide a thumb safety on both sides of the pistol (ambidextrous), thereby better meeting the needs of left-handed, as well as right-handed users. Many SA semi-automatic pistols have a hammer position known as "
half-cock Half-cock is when the position of the hammer of a firearm is partially—but not completely—cocked. Many firearms, particularly older firearms, had a notch cut into the hammer allowing half-cock, as this position would neither allow the gun t ...
ed". Squeezing the trigger will not fire the gun when it is in the half-cocked position, and neither will dropping the gun in this state cause an accidental discharge. During World War II in the Pacific Theater, an unofficial and unapproved carry mode for the SA M1911 by left-handed US soldiers in combat was carrying the gun with the magazine full, a round chambered, the action in half-cocked position, and the thumb safety (accessible only to right-handed users) positioned in the off (or ready-to-fire) mode. The primary advantage of the half-cocked position versus the uncocked position in that particular scenario was added sound suppression (of the click of the weapon being cocked). A secondary advantage was the avoidance of accidental discharges if the gun was accidentally dropped. The half-cock was revised by Colt in the 1970s and subsequently other manufacturers – the hammer will fall from half-cock if the trigger is pulled on most newer 1911 type guns.


Technology

A self-loading pistol reloads the chamber with a new round automatically each time the weapon is fired, without additional action being required by the user. For a semi-automatic pistol, this is typically accomplished by recoil operation. In a machine pistol, in contrast, this can be accomplished by blowback, or, less commonly, by
gas operation Gas-operation is a system of operation used to provide energy to operate locked breech, autoloading firearms. In gas-operation, a portion of high-pressure gas from the cartridge being fired is used to power a mechanism to dispose of the spent ...
, harnessing gases produced when the gun is fired. The
Desert Eagle The Desert Eagle is a gas-operated, semi-automatic pistol known for chambering the .50 Action Express, the largest centerfire cartridge of any magazine-fed, self-loading pistol. Magnum Research Inc. (MRI) designed and developed the Desert Eagle ...
is a rare example of a semi-automatic pistol that siphons off some of the gases instead of relying on short recoil operation. A revolver, which uses multiple chambers and a single barrel, and a
derringer A derringer is a small handgun that is neither a revolver nor a semi/ fully automatic pistol. It is not to be confused with mini-revolvers or pocket pistols, although some later derringers were manufactured with the pepperbox configuration. ...
, which uses multiple chambers and multiple barrels, also fire one round per trigger pull, but achieve this in different ways and as such are not classified as being semi-automatic. A semi-automatic pistol will fire only one shot per trigger pull, in contrast to a "fully automatic" or machine pistol, which continues to fire as long as the trigger is held or until all rounds have been fired. The
Mauser M712 Schnellfeuer The Mauser C96 (''Construktion 96'') is a semi-automatic pistol that was originally produced by German arms manufacturer Mauser from 1896 to 1937. Unlicensed copies of the gun were also manufactured in Spain and China in the first half of the 20t ...
(German for "rapid fire"), a modified Mauser C96 pistol, is a notable example of a true machine pistol. While both types of weapons operate on the same principles, fully automatic weapons must be built more ruggedly to accommodate the heat and stress caused by rapid firing, and it can be difficult (and illegal in most countries) to convert a semi-automatic pistol into a fully automatic mode of fire. A
selective-fire Selective fire is the capability of a weapon to be adjusted to fire in semi-automatic, fully automatic, and/or burst mode. The modes are chosen by means of a selector switch, which varies depending on the weapon's design. Some selective-fire we ...
action pistol, though, can be converted back and forth by means of a switch, and often includes a burst mode, typically for a three-round burst with each trigger pull. Selective-fire weapons are generally used by specialized law enforcement and security personnel such as SWAT teams, hostage rescue teams, anti-terrorist units, or government bodyguards for heads of state. In the United States, selective-fire weapons are not available to civilians unless they live in a state that allows civilian ownership of
National Firearms Act The National Firearms Act (NFA), 73rd Congress, Sess. 2, ch. 757, was enacted on June 26, 1934, and currently codified and amended as . The law is an Act of Congress in the United States that, in general, imposes an excise tax on the manufact ...
or Title II weapons.


Actions: blowback versus locked breech

Self-loading automatic pistols can be divided into "blowback" and "locked breech" categories according to their principle of operation. The blowback operating principle is suitable for smaller, lower-powered calibers, such as
.32 ACP .32 ACP ( Automatic Colt Pistol, also known as .32 Automatic) is a centerfire pistol cartridge. It is a semi-rimmed, straight-walled cartridge developed by firearms designer John Browning, initially for use in the FN M1900 semi-automatic pi ...
and
.380 ACP The .380 ACP (9×17mm) ( Automatic Colt Pistol) is a rimless, straight-walled pistol cartridge developed by firearms designer John Moses Browning. The cartridge headspaces on the mouth of the case.Wilson, R. K. ''Textbook of Automatic Pisto ...
, as the resistance of the recoil spring and mass of the slide are sufficient to retard the opening of the breech until the projectile has left the barrel and breech pressure has dropped to a safe level. For more powerful calibers such as the 9 mm Parabellum (9 mm) and
.45 ACP The .45 ACP ( Automatic Colt Pistol) or .45 Auto (11.43×23mm) is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it ...
, some form of locked-breech is needed to retard breech opening, as an unlocked blowback pistol in these calibers requires a very heavy slide and stiff spring, making them bulky, heavy, and difficult to operate. A somewhat commercially successful blowback pistol design in the more powerful calibers was produced; the Spanish
Astra 400 The Astra modelo 400 was a Spanish service pistol produced by weapons manufacturer Astra-Unceta y Cia SA.Antaris, Leonardo M. ''American Rifleman'' (December 2008) pp.58-68 as a replacement for the Campo-Giro 1913/1916, which had also been chamb ...
in 9 mm largo and the similar Astra 600 in 9 mm Parabellum. U.S. manufacturer Hi-Point also produces a line of blowback-operated pistols in several calibers, including 9 mm and .45 ACP. Virtually all other service-caliber pistols are locked-breech designs


History

After
Hiram Maxim Sir Hiram Stevens Maxim (5 February 1840 – 24 November 1916) was an American- British inventor best known as the creator of the first automatic machine gun, the Maxim gun. Maxim held patents on numerous mechanical devices such as hair-curl ...
introduced his recoil-powered machine gun in 1883, several gunsmiths set out to apply the same principles to handguns, including Maxim. Maxim's designs for smaller firearms using his recoil-powered ideas never went into production. In the 1880s, other designers worked on self-loading designs. The Salvator Dormus was the first semi-automatic pistol followed closely by the Schönberger-Laumann 1892. The first model to gain any commercial success was
Hugo Borchardt Hugo Borchardt (June 6, 1844 – May 8, 1924) was a firearms inventor and engineer, born in Magdeburg, Germany. He is known for his inventions of the Borchardt C-93 pistol and the Sharps-Borchardt Model 1878 rifle. In 1860 he emigrated to the Unit ...
's C-93, which, together with the 7.65 mm Borchardt cartridge, had been designed in 1893 and made its public debut in 1894. Borchardt based the principle of the C-93's mechanism in large part upon Maxim's toggle-lock. The C-93 featured a locking mechanism modeled after the human knee, which is called ''Kniegelenk'' in German (knee joint). The C-93 proved mechanically reliable but was too large and bulky to receive widespread acceptance. Equipped with a screw-on wooden stock, the C-93 served well as a small pistol
carbine A carbine ( or ) is a long gun that has a barrel shortened from its original length. Most modern carbines are rifles that are compact versions of a longer rifle or are rifles chambered for less powerful cartridges. The smaller size and lighte ...
. In 1896, Paul Mauser introduced the first model of his Mauser "Broomhandle" semi-automatic pistol, the C96. This was the first mass-produced and commercially successful pistol to have a large-capacity, staggered-column magazine holding 10 or 20 rounds. Its original cartridge was called 7.63 mm Mauser, which was more powerful but otherwise identical to the 7.65 mm Borchardt. The Mauser was one of the first self-loading pistols used extensively in battle, notably the
Second Boer War The Second Boer War ( af, Tweede Vryheidsoorlog, , 11 October 189931 May 1902), also known as the Boer War, the Anglo–Boer War, or the South African War, was a conflict fought between the British Empire and the two Boer Republics (the South ...
of 1899–1902. These pistols were made in 7.63 mm Mauser, or 9×25 mm Mauser, along with some models eventually being made in 9 mm Parabellum and a small number in
.45 ACP The .45 ACP ( Automatic Colt Pistol) or .45 Auto (11.43×23mm) is a rimless straight-walled handgun cartridge designed by John Moses Browning in 1904, for use in his prototype Colt semi-automatic pistol. After successful military trials, it ...
for China. 1898 saw the
Schwarzlose Model 1898 The Schwarzlose Model 1898 was a full-size, locked-breech, rotary-bolt, semi-automatic pistol invented by Prussian firearm designer Andreas Wilhelm Schwarzlose. It was chambered for cartridges such as the 7.65×25mm Borchardt and 7.63×25mm Ma ...
, a semi-automatic pistol invented by Prussian firearm designer
Andreas Wilhelm Schwarzlose Andreas Wilhelm Schwarzlose (31 July 1867 – 1936) was a German (originally Prussian) firearm designer who is best known for designing a blowback-operated machine gun. Early life Schwarzlose was born near Wust, and served as an artilleryman and ...
. It was chambered for the 7.65×25mm Mauser, but could also shoot the weaker Borchardt ammunition. The Schwarzlose design was most advanced and far ahead of its time, but not widely adopted with less than 1000 pieces being manufactured. Small lots were sold to members of the Russian Social-Democratic Party who were plotting insurrection but were confiscated at the Russian border and issued to the Imperial Russian Frontier Guards. In
Belgium Belgium, ; french: Belgique ; german: Belgien officially the Kingdom of Belgium, is a country in Northwestern Europe. The country is bordered by the Netherlands to the north, Germany to the east, Luxembourg to the southeast, France to th ...
in 1896 American gun designer John Browning developed self-loading semi-automatic pistols. His models were first manufactured in Europe by the Belgian firm of
Fabrique Nationale Fabrique Nationale Herstal (), trading as FN Herstal and often referred to as Fabrique Nationale or simply FN, is a leading firearms manufacturer based in Herstal, Belgium. It is currently the largest exporter of military small arms in Europe. ...
(FN) and later by
Colt Colt(s) or COLT may refer to: *Colt (horse), an intact (uncastrated) male horse under four years of age People * Colt (given name) *Colt (surname) Places *Colt, Arkansas, United States *Colt, Louisiana, an unincorporated community, United States ...
in the U.S. Browning's first successful design was the Browning M1900. Like
Georg Luger Georg Johann Luger (March 6, 1849 – December 22, 1923) was an Austrian designer of the famous Luger pistol and the 9×19mm Parabellum cartridge. Early life and military service Georg Luger was born in Steinach am Brenner, Tyrol to Dr. Ba ...
's work conducted around the same time in Germany, it was designed alongside a in 7.65 mm cartridge, but the 7.65 mm Browning (aka .32 Auto) differs substantially from Luger's 7.65 mm Parabellum. Browning went on to design .25, .38, .380, and .45 ACP cartridges for his semi-automatic pistol designs. Browning must be given credit for developing the type of locked-breech action which is commonly used by the vast majority of modern large caliber semi-automatic pistols. One of Browning's most enduring designs was the
Colt M1911 The M1911 (Colt 1911 or Colt Government) is a single-action, recoil-operated, semi-automatic pistol chambered for the .45 ACP cartridge. The pistol's formal U.S. military designation as of 1940 was ''Automatic Pistol, Caliber .45, M1911'' for th ...
, which was adopted by the U.S. military as its
service pistol 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, ...
and is still in active use with some U.S. Special Forces and
Marine Corps Marines, or naval infantry, are typically a military force trained to operate in littoral zones in support of naval operations. Historically, tasks undertaken by marines have included helping maintain discipline and order aboard the ship (refl ...
units, albeit in modernized forms (the M45A1 Pistol is a prime example). Browning also co-designed the FN Browning Hi-Power, announced in 1922, during the last years of his life, working on this design until his death in 1926. This was a 9 mm semi-automatic pistol capable of holding 13 rounds in the magazine (plus one chambered). The next notable design was the 7.65 mm Luger by
Georg Luger Georg Johann Luger (March 6, 1849 – December 22, 1923) was an Austrian designer of the famous Luger pistol and the 9×19mm Parabellum cartridge. Early life and military service Georg Luger was born in Steinach am Brenner, Tyrol to Dr. Ba ...
, which although successful in its function, nonetheless failed to have adequate stopping power and failed to win widespread acceptance. In 1902, Luger's subsequent and similar P08 in 9 mm Parabellum overcame the problem of inadequate stopping power and featured a greatly improved Borchardt-type ''Kniegelenk'' ("knee-joint") locking mechanism. Unlike Browning's locked-breech design, the barrel in a ''Kniegelenk'' design does not tip up and down while the gun is fired, thereby theoretically improving shooting accuracy. Luger's P.08 was adopted by the German military and served as their standard sidearm in
World War I World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
. During
World War II World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
, Germany was the first nation to adopt a
double-action Double action (or double-action) refers to one of two systems in firearms where the trigger both cocks and releases the hammer. *Double-action only (DAO) firearms trigger: The trigger both cocks and releases the hammer. There is no single-action f ...
pistol, the
Walther P38 The Walther P38 (originally written Walther P.38) is a 9 mm semi-automatic pistol that was developed by Carl Walther GmbH as the service pistol of the Wehrmacht at the beginning of World War II. It was intended to replace the costly Luger P08 ...
, which could be carried loaded (with a cartridge chambered) and ready to fire without the risk of an accidental discharge if dropped. The P38 also used Luger's 9 mm Parabellum cartridge. During World War II, revolvers were still issued by various major powers, but their use was decreasing. Though the British firm
Webley & Scott Webley & Scott is an arms manufacturer founded in Birmingham, England. Webley produced handguns and long guns from 1834 to 1979, when the company ceased to manufacture firearms and instead turned its attention to producing air pistols and ai ...
had developed several adequate self-loading pistols, one of which was adopted by the (normally unarmed) British police in 1911 and by the Royal Navy and Royal Marines before the First World War, revolvers were generally preferred by most British military. In the Soviet Union, the
TT pistol The TT-30,, "7.62 mm Tokarev self-loading pistol model 1930", TT stands for Tula-Tokarev) commonly known simply as the Tokarev, is an out-of-production Soviet semi-automatic pistol. It was developed in 1930 by Fedor Tokarev as a service pi ...
replaced the Nagant M1895 revolver during the war. In the United States, the M1911A1 was adopted as the standard military sidearm. Both Colt and
Smith & Wesson Smith & Wesson Brands, Inc. (S&W) is an American firearm manufacturer headquartered in Springfield, Massachusetts, United States. Smith & Wesson was founded by Horace Smith and Daniel B. Wesson as the "Smith & Wesson Revolver Company" in 1856 ...
produced revolvers chambered for the same .45 ACP ammunition used in the M1911A1, because of the great demand for handguns and the need to adopt a common cartridge for use in both semi-automatic pistols and revolvers. After World War II, most nations eventually adopted 9 mm Parabellum caliber pistols employing some variant of Browning's locked-breech design for their standard-issue military pistols. The most popular early choice was the FN Browning Hi-Power mentioned above; another popular model was the locked-breech Walther P38 because of its many safety features. , the U.S. military sidearm is a variant of the
Beretta 92 The Beretta 92 (also Beretta 96 and Beretta 98) is a series of semi-automatic pistols designed and manufactured by Beretta of Italy. The Beretta 92 was designed in 1975, and production began in 1976. Many variants in several different calibers c ...
F/FS. * 1971, Smith & Wesson offered a safe double-action, high-capacity pistol, the Model 59. * 1975, Beretta introduced the
Beretta 92 The Beretta 92 (also Beretta 96 and Beretta 98) is a series of semi-automatic pistols designed and manufactured by Beretta of Italy. The Beretta 92 was designed in 1975, and production began in 1976. Many variants in several different calibers c ...
* 1975, CZ launched the
CZ-75 The CZ 75 is a semi-automatic pistol made by Czech firearm manufacturer ČZUB. First introduced in 1975, it is one of the original " wonder nines" and features a staggered-column magazine, all-steel construction, and a hammer forged barrel. I ...
* 1982,
Glock Glock is a brand of polymer-Receiver (firearms), framed, Recoil operation#Short recoil operation, short recoil-operated, locked-breech semi-automatic pistols designed and produced by Austrian manufacturer Glock Ges.m.b.H., Glock Ges.m.b.H. The ...
introduced the groundbreaking
Glock 17 Glock is a brand of polymer- framed, short recoil-operated, locked-breech semi-automatic pistols designed and produced by Austrian manufacturer Glock Ges.m.b.H. The firearm entered Austrian military and police service by 1982 after it was th ...
with a polymer frame * 1983, SIG Sauer introduced the model P226. * 1988, Walther introduced the P88. * 1993,
Heckler & Koch Heckler & Koch GmbH (HK; ) is a German defense manufacturing company that manufactures handguns, rifles, submachine guns, and grenade launchers. The company is located in Oberndorf am Neckar in the German state of Baden-Württemberg, and also ...
combined what they considered to be the most desirable attributes of semi-autos and created the
Heckler & Koch USP The USP (''Universelle Selbstladepistole'' or "universal self-loading pistol") is a semi-automatic pistol developed in Germany by Heckler & Koch GmbH (H&K) as a replacement for the P7 series of handguns. History Design work on a new family of p ...
. * 1995,
Kel-Tec Kel-Tec CNC Industries Inc., commonly referred to as Kel-Tec, is an American developer and manufacturer of firearms. Founded by George Kellgren in 1991 and based in Cocoa, Florida, the company has manufactured firearms since 1995, starting with ...
introduced their first compact 9 mm pistol, the
Kel-Tec P-11 The Kel-Tec P-11 is a compact, Semi-automatic pistol, semi-automatic, recoil operation, short-recoil operated pistol chambered in 9mm Luger Parabellum, 9 mm Luger. It was manufactured by Kel-Tec CNC Industries of Cocoa, FL from 1995 to 2019. ...
, designed for
concealed carry Concealed carry, or carrying a concealed weapon (CCW), is the practice of carrying a weapon (usually a sidearm such as a handgun), either in proximity to or on one's person or in public places in a manner that hides or conceals the weapon's pr ...
. * 1999, Kel-Tec introduced their .32 ACP
Kel-Tec P-32 The Kel-Tec P-32 is a sub-compact semi-automatic pistol using the short-recoil principle of operation that is chambered in .32 ACP. It was designed by George Kellgren. It is manufactured by Kel-Tec CNC Industries Inc., of Cocoa, Florida and was ...
for concealed carry. After the Second World War, the almost universal trend has been for semi-automatic pistols to replace revolvers for military use, although the transition has been slower in police and civilian use. , revolvers are mainly used in jurisdictions that permit their use for civilian self-defense, hunting,
plinking Plinking refers to informal target shooting done for pleasure, typically at non-standard targets such as tin cans, logs, bottles, or any other homemade or naturally occurring target. Practice In contrast to shooting done at established targe ...
, and target practice. Semi-automatic pistols are by far the most popular for concealed carry by civilians, primary handguns for police and military use, backup guns for police use, and where the usual five or six shots of a revolver are deemed inadequate.


See also

*
Assault weapon In the United States, ''assault weapon'' is a controversial term used to define firearms with specified characteristics. The definition varies among regulating jurisdictions, but usually includes semi-automatic firearms with a detachable magaz ...
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List of semi-automatic pistols A semi-automatic pistol is a type of handgun which utilizes the energy of the fired cartridge to cycle the action of the weapon and advance the next available cartridge into position for firing Dismissal (also called firing) is the termination ...
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Personal defense weapon Personal defense weapons (PDWs) are a class of firearms intended for self-defense and security rather than warfare and infantry. Most PDWs fire a small-caliber (less than ), centerfire bottleneck cartridge resembling a scaled-down intermedia ...
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Semi-automatic rifle A semi-automatic rifle is an autoloading rifle that fires a single cartridge with each pull of the trigger, and uses part of the fired cartridge's energy to eject the case and load another cartridge into the chamber. For comparison, a bolt-a ...
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Semi-automatic shotgun A semi-automatic shotgun is a repeating shotgun with a semi-automatic action, i.e. capable of automatically chambering a new shell after each firing, but requires individual trigger-pull to manually actuate each shot. Semi-automatic shotguns ...


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Ballistics By The Inch showing relationship between barrel length and bullet velocity for handguns.


{{Firearms Firearm actions Handguns Firearm terminology