Combat shotgun
Encyclopedia
A combat shotgun is a shotgun
Shotgun
A shotgun is a firearm that is usually designed to be fired from the shoulder, which uses the energy of a fixed shell to fire a number of small spherical pellets called shot, or a solid projectile called a slug...

 that is intended for use in an offensive role, typically by a military force. The earliest shotguns specifically designed for combat were the trench guns or trench shotguns issued in World War I. While limited in range, the multiple projectiles typically used in a shotgun shell
Shotgun shell
A shotgun shell is a self-contained cartridge loaded with lead shot or shotgun slug designed to be fired from a shotgun....

 provide increased hit probability unmatched by other small arms.

History

While the sporting shotgun traces its ancestry back to the fowling piece, which was a refinement of the smoothbore
Smoothbore
A smoothbore weapon is one which has a barrel without rifling. Smoothbores range from handheld firearms to powerful tank guns and large artillery mortars.-History of firearms and rifling:...

 musket
Musket
A musket is a muzzle-loaded, smooth bore long gun, fired from the shoulder. Muskets were designed for use by infantry. A soldier armed with a musket had the designation musketman or musketeer....

, the combat shotgun bears more kinship to the shorter blunderbuss
Blunderbuss
The blunderbuss is a muzzle-loading 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 and/or caliber. The blunderbuss could be considered to be an early form of shotgun,...

. Invented in the 16th century by the Dutch, the blunderbuss was used through the 18th century in warfare by British, Austrian, and Prussian regiments, as well as in the American colonies. As use of the blunderbuss declined, the United States military began to load "buck and ball
Buck and ball
Buck and ball was a common load for muzzle-loading muskets, and was very commonly used into the early days of the American Civil War. The load consisted of a .69 caliber round lead musket ball combined with three buckshot pellets.-Construction:...

". Buck and ball was used extensively by Americans at the Battle of New Orleans
Battle of New Orleans
The Battle of New Orleans took place on January 8, 1815 and was the final major battle of the War of 1812. American forces, commanded by Major General Andrew Jackson, defeated an invading British Army intent on seizing New Orleans and the vast territory the United States had acquired with the...

 in 1814 and was partially responsible for the disparate casualty rates between American and British forces. Many of the British wounded recovered quickly as they had been struck by the buckshot rather than the ball. Buck and ball had a greater chance of hitting the enemy but did not cause as severe wounds at longer ranges (although any wound was liable to take a soldier out of a particular fight). Fowling pieces were commonly used by militias, for example during the Texas Revolution
Texas Revolution
The Texas Revolution or Texas War of Independence was an armed conflict between Mexico and settlers in the Texas portion of the Mexican state Coahuila y Tejas. The war lasted from October 2, 1835 to April 21, 1836...

. However buck and ball worked as well or better in standard or even rifled muskets. Buck and ball loads were used by both sides of the American Civil War
American Civil War
The American Civil War was a civil war fought in the United States of America. In response to the election of Abraham Lincoln as President of the United States, 11 southern slave states declared their secession from the United States and formed the Confederate States of America ; the other 25...

, often by cavalry units.

The development of the repeating pump action shotguns in the 1890s led to their use by US Marines in the Philippines insurrections and by General "Black Jack" Pershing
John J. Pershing
John Joseph "Black Jack" Pershing, GCB , was a general officer in the United States Army who led the American Expeditionary Forces in World War I...

's pursuit of Pancho Villa
Pancho Villa
José Doroteo Arango Arámbula – better known by his pseudonym Francisco Villa or its hypocorism Pancho Villa – was one of the most prominent Mexican Revolutionary generals....

, and "riot" shotguns quickly gained favor with civilian police units, but the modern concept of the combat shotgun was fully developed by the American Expeditionary Forces during World War I. The trench gun, as it was called, was a short-barreled pump action shotgun loaded with 6 rounds containing antimony
Antimony
Antimony is a toxic chemical element with the symbol Sb and an atomic number of 51. A lustrous grey metalloid, it is found in nature mainly as the sulfide mineral stibnite...

 hardened 00 buckshot, and equipped with a bayonet. The M1897
Winchester Model 1897
The Winchester Model 1897, also known as the Model 97, M97, or Trench Gun, was a pump-action shotgunwith an external hammer and tube magazine manufactured by the Winchester Repeating Arms Company. The Model 1897 was an evolution of the Winchester Model 1893 designed by John Browning. From 1897...

 and M1912 also could be slam fired
Slamfire
A slamfire is a premature, unintended discharge of a firearm that occurs as a round is being loaded into the chamber. Slamfires are most common in military firearms that have a free-floating firing pin, as opposed to a spring-loaded one...

: the weapon having no trigger disconnector
Trigger disconnector
A trigger disconnector is a type of safety in a firearm, which prevents the trigger from being held down after a shot has been fired. This disallows either automatic fire or deliberate "slam fire", depending upon the particular firearm's action. Notable firearms that lack this feature include...

, shells could be fired one after the other simply by working the slide if the trigger was held down. When fighting within a trench, the shorter shotgun could be rapidly turned and fired in both directions along the trench axis. The shotguns proved effective enough at short combat ranges to elicit a diplomatic protest from the German government, claiming the shotguns caused excessive injury, and that any troops found in possession of them would be subject to execution. The US Government rejected the claims, and threatened reprisals in kind if any US troops were executed for possession of a shotgun, however there is no evidence that the Germans carried out their threat.

During the trench warfare of the Gallipoli Campaign, Major Stephen Midgley of the Australian 5th Light Horse Regiment was widely known to use a sawn-off double barrelled shotgun
Sawed-off shotgun
A sawed-off shotgun also called a sawn-off shotgun and a short-barreled shotgun , is a type of shotgun with a shorter gun barrel and often a shorter or absent stock....

 while leading his troops, the weapon's effectiveness resulting in Turkish officers complaining that it was not a 'weapon of war' under international law after Midgley took one Turkish soldier's head "clean off his shoulders". Midgley was ordered by an Australian general to cease using his shotgun and switch to a conventional rifle and bayonet, to which the Major was "bitterly peeved".

The shotgun was also well suited for house-to-house fighting. An example of this effectiveness is an event from September 27, 1918. Sergeant Fred Lloyd, armed with a Winchester Model 1897 trench gun, single-handedly retook a German-held French village, routing 30 German soldiers.

The shotgun was used by Allied forces and Allied supported partisans in all theaters of combat in World War II, and both pump and semi-automatic shotgun
Semi-automatic shotgun
A semi-automatic shotgun is a form of shotgun that is able to fire a cartridge after every trigger squeeze, without any manual chambering of another round being required...

s are currently issued to all branches of the US military; they have also been used in subsequent conflicts by French, British, Australian, and New Zealand forces, as well as many guerrillas and insurgents throughout sub-Saharan Africa, Latin and South America, and Southeast Asia. Six different model of shotguns were accepted in the US army during World War II, the most popular being the M97
Winchester Model 1897
The Winchester Model 1897, also known as the Model 97, M97, or Trench Gun, was a pump-action shotgunwith an external hammer and tube magazine manufactured by the Winchester Repeating Arms Company. The Model 1897 was an evolution of the Winchester Model 1893 designed by John Browning. From 1897...

 and M1912
Winchester Model 1912
The Winchester Model 1912 is a hammerless slide-action, i.e., pump-action, shotgun with an external tube magazine. Popularly-named the Perfect Repeater at its introduction, it largely set the standard for pump action shotguns over its 51 year high-rate production life...

. One disadvantage of using a shotgun in the Pacific Theatre was the way of carrying the shotshells. The standard rifle pouches that carried shotshells were small, only about 30 rounds if carried vertically. The Marines would carry the shells in a SL-3 grenade vest from World War I, but these vests were hard to come by. Instead the Marine shotgunner would use whatever he could find to carry the shells by using improvised "homemade" gear or modified bandolier
Bandolier
A bandolier or a bandoleer is a pocketed belt for holding ammunition. It was usually slung over the chest. In its original form, it was common issue to soldiers from the 16th to 18th centuries. This was very useful for quickly reloading a musket....

.

Another disadvantage was paper-hulled shotshells
Shotgun shell
A shotgun shell is a self-contained cartridge loaded with lead shot or shotgun slug designed to be fired from a shotgun....

, which would swell when wet, and not fit into the chamber even after drying out. Military-issue shotshells were usually made entirely of brass to avoid this problem, until the advent of plastic hulls.

Gen Douglas MacArthur
Douglas MacArthur
General of the Army Douglas MacArthur was an American general and field marshal of the Philippine Army. He was a Chief of Staff of the United States Army during the 1930s and played a prominent role in the Pacific theater during World War II. He received the Medal of Honor for his service in the...

 attempted to restrict the use of shotgun even though the shotgun had proven its worth amongst the Marines in the Pacific war
Pacific War
The Pacific War, also sometimes called the Asia-Pacific War refers broadly to the parts of World War II that took place in the Pacific Ocean, its islands, and in East Asia, then called the Far East...

 during close combat in trench and jungle fighting.
General Alexander Patch
Alexander Patch
General Alexander McCarrell "Sandy" Patch was an officer in the United States Army, best known for his service in World War II. He commanded Army and Marine forces during the invasion of Guadalcanal, and the U.S...

 was seen being armed with a Winchester shotgun when he personally led an attack in Guadalcanal
Guadalcanal campaign
The Guadalcanal Campaign, also known as the Battle of Guadalcanal and codenamed Operation Watchtower by Allied forces, was a military campaign fought between August 7, 1942 and February 9, 1943 on and around the island of Guadalcanal in the Pacific theatre of World War II...

.

In the jungle warfare
Jungle warfare
Jungle warfare is a term used to cover the special techniques needed for military units to survive and fight in jungle terrain.It has been the topic of extensive study by military strategists, and was an important part of the planning for both sides in many conflicts, including World War II and the...

 during the Malayan Emergency
Malayan Emergency
The Malayan Emergency was a guerrilla war fought between Commonwealth armed forces and the Malayan National Liberation Army , the military arm of the Malayan Communist Party, from 1948 to 1960....

, the British Army
British Army
The British Army is the land warfare branch of Her Majesty's Armed Forces in the United Kingdom. It came into being with the unification of the Kingdom of England and Scotland into the Kingdom of Great Britain in 1707. The new British Army incorporated Regiments that had already existed in England...

 and local forces of Malaysia
Federation of Malaya
The Federation of Malaya is the name given to a federation of 11 states that existed from 31 January 1948 until 16 September 1963. The Federation became independent on 31 August 1957...

 used shotguns to great effect due to limited space in the jungles and frequent close combat. In the Vietnam War
Vietnam War
The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

, the shotgun was used as an individual weapon in the American army during jungle patrol and urban warfare
Urban warfare
Urban warfare is combat conducted in urban areas such as towns and cities. Urban combat is very different from combat in the open at both the operational and tactical level...

 like the Tet Offensive.

During the Somalian conflict
Somali Civil War
The Somali Civil War is an ongoing civil war taking place in Somalia. The conflict, which began in 1991, has caused destabilisation throughout the country, with the current phase of the conflict seeing the Somali government losing substantial control of the state to rebel forces...

 in 1992, the US task forces tested out a new type of Remington shotgun called Ciener Ultimate Over/Under
Ciener Ultimate Over/Under
The Ciener Ultimate Over/Under system is a modification of the Remington 870 by Johnathan Arthur Ciener. It is identical in purpose to the Knight's Armament Company Masterkey or the accessory weapon configuration of the Remington 870 MPS....

, which was an under-barrel attachment for the standard M16
M16 rifle
The M16 is the United States military designation for the AR-15 rifle adapted for both semi-automatic and full-automatic fire. Colt purchased the rights to the AR-15 from ArmaLite, and currently uses that designation only for semi-automatic versions of the rifle. The M16 fires the 5.56×45mm NATO...

 variants during Operation Gothic Serpent
Operation Gothic Serpent
Operation Gothic Serpent was a military operation conducted by special operations forces of the United States with the primary mission of capturing warlord Mohamed Farrah Aidid...

. The idea was for a soldier in an entry team to be able to breach a locked door with the shotgun and then immediately switch to the assault rifle
Assault rifle
An assault rifle is a selective fire rifle that uses an intermediate cartridge and a detachable magazine. Assault rifles are the standard infantry weapons in most modern armies...

 to clear the room. According to the Army Rangers, their verdict was positive for this new type of breaching gun.

In current operations in post-invasion Iraq, the US forces are using their official combat shotguns to clear out suspected insurgent
Iraqi insurgency
The Iraqi Resistance is composed of a diverse mix of militias, foreign fighters, all-Iraqi units or mixtures opposing the United States-led multinational force in Iraq and the post-2003 Iraqi government...

 hideouts in house to house fighting. One notable experimental shotgun used in limited numbers during Operation Enduring Freedom is the XM26 for breaching doors or close-quarter battle (CQB).

In modern times, with Mechanized Infantry
Mechanized infantry
Mechanized infantry are infantry equipped with armored personnel carriers , or infantry fighting vehicles for transport and combat ....

 tactics armed forces don't need to "march to battle" as in earlier conflicts. Because of this, they are able to omit the difficult choice of selecting only one weapon in order to save weight. This allows the individual soldier to carry a shotgun as well as an assault rifle during battle.

Characteristics

The most common type of shotgun used for this purpose is the manually-operated, slide-action/pump-action type
Pump action shotgun
Pump-action shotguns, also called 'slide action repeating shotguns' or 'slide action shotguns' are a class of shotguns that are distinguished in the way in which spent shells are extracted and fresh ones are chambered. The weapon has a single barrel above a tube magazine into which shells are...

, because it is less prone to malfunction (particularly when dirty) than semi-automatic
Semi-automatic firearm
A semi-automatic, or self-loading firearm is a weapon which performs all steps necessary to prepare the weapon to fire again after firing—assuming cartridges remain in the weapon's feed device or magazine...

 designs. Pump-action shotguns are also less expensive than their semi-automatic counterparts. Even so, semi-automatic shotguns such as the SPAS-12 and Benelli M1014 are currently seeing service in NATO-aligned armed forces. The Mossberg 590A1 is currently the pump-action of choice for US armed forces and has seen service with other militaries.

Combat shotguns typically have much shorter barrels than shotguns for hunting and usually, though not always, have magazines of modified design to hold more than the 3 to 5 shots normal with sporting or hunting shotguns. Most combat shotguns have tubular magazines to hold the cartridges, mounted underneath the barrel, identical to those of hunting shotguns except for being longer to hold more ammunition, though some recent designs have detachable box magazines.

Combat shotguns for military use are mostly similar to the police riot shotgun
Riot shotgun
A riot shotgun is a shotgun designed or modified for use as a primarily defensive weapon, primarily by the use of a short barrel. The riot shotgun is used by military personnel for guard duty and was at one time used for riot control, and is commonly used as a patrol weapon by law enforcement...

; but the military versions may have provisions to mount a bayonet
Bayonet
A bayonet is a knife, dagger, sword, or spike-shaped weapon designed to fit in, on, over or underneath the muzzle of a rifle, musket or similar weapon, effectively turning the gun into a spear...

 and may be fitted with ventilated steel or plastic hand guards over the barrel to reduce the danger of a soldier burning his hand on the hot barrel during rapid fire. Riot shotguns are also more likely to trade off the increased magazine capacity for the decreased size that entails; for example, a combat model would be more likely to have a 51 cm (20 inch) barrel and a 7 to 10 shot capacity, while riot shotguns are often found with barrels of 35 to 46 cm (14 to 18 inches) and a capacity of 5 or 6 rounds.

Combat use

The combat shotgun has evolved from its original role as a short range combat weapon into a wider role in modern times. With proper configuration, ammunition and training, the modern combat shotgun plays three roles:
  1. Offensive weapon
  2. Breaching system
  3. Less lethal crowd control


Effective range of the shotgun with standard buckshot is limited to about 30–40 meters with a full stock (depending on the sights on the gun), and 10 when equipped only with a pistol grip due to the difficulty in accurately aiming without a full stock. Slug rounds, if available, can extend the effective range of the shotgun to 100 meters (although this is also dependent on the shotgun's sighting system; right sights and ghost ring sights will allow the average shooter to effectively engage human-sized targets at considerably greater distances than with a bead sight).

Less lethal rounds vary, with ranges from 10 meters for rubber buckshot to 75 meters for rubber slugs. These less lethal munitions are the same type as used by police, and have served well in riot control situations, such as that in Kosovo
Kosovo
Kosovo is a region in southeastern Europe. Part of the Ottoman Empire for more than five centuries, later the Autonomous Province of Kosovo and Metohija within Serbia...

 in 2001.

When used as a door breaching
Door breaching
Door breaching is a process used by military, police, or emergency services to force open closed and/or locked doors. A wide range of methods are available, one or more of which may be used in any given situation...

 system, the shotgun may be provided with a muzzle extension to allow it to be pressed firmly against the door while providing the correct standoff distance for optimum performance. While there are specialized rounds for breaching doors with minimal hazard to any occupants of the room, any type of round will do the job, though with some degradation of effectiveness and increased risk of collateral damage. In operations in Iraq, the shotgun was the preferred method of door breaching by infantry units, ideally with a frangible breaching slug. For the breaching role, shorter barrels are preferred, as they are more easily handled in tight quarters.

Limited ammunition capacity is one of the primary downsides of the combat shotgun. While box magazines are available in some models (such as shotgun derivatives of the AK-47
AK-47
The AK-47 is a selective-fire, gas-operated 7.62×39mm assault rifle, first developed in the Soviet Union by Mikhail Kalashnikov. It is officially known as Avtomat Kalashnikova . It is also known as a Kalashnikov, an "AK", or in Russian slang, Kalash.Design work on the AK-47 began in the last year...

 design, like the Saiga-12
Saiga-12
The Saiga-12 is a Kalashnikov-pattern 12 gauge combat shotgun available in a wide range of configurations. Like the Kalashnikov rifle variants, it is a rotating bolt, gas-operated gun that feeds from a box magazine...

), the tubular magazine is still dominant. This limits capacities; the current US pump shotgun issued, the Mossberg 500
Mossberg 500
Mossberg 500 is a series of shotguns manufactured by O.F. Mossberg & Sons. The 500 series comprises widely varying models of hammerless, pump action repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, magazine capacity, and...

, has a 5 or 8 shot capacity depending on barrel length. The tubular magazine does allow easy "topping off" (a tube-fed pump shotgun can be kept shouldered and aimed at a target and ready to fire while being loaded), so training emphasizes the need to load the magazine to full capacity whenever the opportunity presents itself. A common doctrine is "shoot one, load one": load a shell immediately after every shot (when this does not jeopardize the operator's safety), to ensure that the shotgun is fully loaded at all times; this ensures that the operator has a full magazine at his/her disposal in case of emergencies when he/she may not be able to reload in between shots. A pistol
Pistol
When distinguished as a subset of handguns, a pistol is a handgun with a chamber that is integral with the barrel, as opposed to a revolver, wherein the chamber is separate from the barrel as a revolving cylinder. Typically, pistols have an effective range of about 100 feet.-History:The pistol...

 is also advised as a backup weapon, should the operator empty the magazine and not have time to reload. A sling to carry the shotgun is essential if it is to be used in conjunction with another weapon, so that the shotgun may be readily accessible.

Effectiveness

A Joint Service Combat Shotgun Program report on the lethality of shotguns in war states, in support of the use of the shotgun in warfare, "the probability of hitting a man-sized target with a shotgun was superior to that of all other weapons", and goes on to support this with statistics compiled by the British from the conflict in Borneo
Borneo
Borneo is the third largest island in the world and is located north of Java Island, Indonesia, at the geographic centre of Maritime Southeast Asia....

 in the 1960s.

The buckshot typically used in a combat shotgun spreads out to a greater or lesser degree depending on the barrel choke, and can be effective at ranges as far as 70 m (75 yards). The delivery of the large number of projectiles simultaneously makes the shotgun the most effective short range weapon commonly used, with a hit probability 45% greater than a submachine gun, and twice as great as an assault rifle. While each pellet is only as effective as a small caliber handgun
Handgun
A handgun is a firearm designed to be held and operated by one hand. This characteristic differentiates handguns as a general class of firearms from long guns such as rifles and shotguns ....

 round, and offers very poor penetration against an armored target, the multiple projectiles increases the likelihood of one or more peripheral wounds.

A number of compromises are involved in choosing a shot size:
  • Smaller pellets lose velocity more rapidly and penetrate the target less
  • Larger pellets means fewer pellets, resulting in a reduced probability of hits
  • Heavier loads produce more recoil and less velocity than lighter loads
  • Reduced recoil loads (less shot and/or lower velocity) may produce smaller patterns, which may decrease hit probability

Ammunition

The most common type of ammunition
Ammunition
Ammunition is a generic term derived from the French language la munition which embraced all material used for war , but which in time came to refer specifically to gunpowder and artillery. The collective term for all types of ammunition is munitions...

 used in combat shotguns, whether for military or law enforcement purposes, is buckshot, typically a 70 mm (2 3/4 inch) 12 gauge shell loaded with 9 hardened 00 buckshot, with a diameter of about 8.4 mm (.33 inch). Buckshot is brutally effective at close ranges against unarmored targets—enough so that Germany issued a protest against its use in 1918. The only other types of ammunition currently in use in military shotguns are breaching round
Breaching round
A breaching round or slug-shot is a shotgun shell specially made for the purposes of door breaching. It is typically fired at a range of 6 inches or less, aimed at the hinges or the area between the doorknob and lock and door jamb, and is designed to destroy the object it hits and then disperse...

s, which are either specially designed frangible
Frangible
A material is said to be frangible if through deformation it tends to break up into fragments, rather than deforming plastically and retaining its cohesion as a single object...

 rounds designed to destroy a door lock or hinge while minimizing the risk of damage to occupants of the room or very light (#9) birdshot, which accomplishes the same purpose. Shotgun slugs are currently under consideration by the US military as an anti-material round; the tendency of typical commercial shotgun slugs to deform on impact would render them illegal under the Hague Convention of 1899 and so a jacketed, hardened or sabot slug may be adopted. Less lethal rounds are used by U.S. troops serving as police forces in occupied territory; beanbag and rubber bullet rounds are commonly used to discourage looters and rioters.

In military use, flechette
Flechette
A flechette is a pointed steel projectile, with a vaned tail for stable flight. The name comes from French , "little arrow" or "dart", and sometimes retains the acute accent in English: fléchette.-Bulk and artillery use:...

 ammunition has also been used in shotguns (primarily by special forces
Special forces
Special forces, or special operations forces are terms used to describe elite military tactical teams trained to perform high-risk dangerous missions that conventional units cannot perform...

, such as its use by the SEAL
United States Navy SEALs
The United States Navy's Sea, Air and Land Teams, commonly known as Navy SEALs, are the U.S. Navy's principal special operations force and a part of the Naval Special Warfare Command as well as the maritime component of the United States Special Operations Command.The acronym is derived from their...

s in the Vietnam War
Vietnam War
The Vietnam War was a Cold War-era military conflict that occurred in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. This war followed the First Indochina War and was fought between North Vietnam, supported by its communist allies, and the government of...

), but this is not common. Other experimental shotgun ammunition has been created, such as SCIMTR
SCIMTR
SCMITR was part of an experimental military shotgun ammunition created in the 1970s by AAI Corporation. It was a variation on flechette ammunition, but instead of containing a bundle of tiny needle-like steel darts, the cartridge contained a stack of razor-edged stamped sheet-metal arrow shapes...

, but none have been successful enough to be adopted.

Due to the great flexibility of the shotgun, it is often used in non-offensive roles as well. The US Infantry, for example, offers a number of less lethal varieties of ammunition for use in the riot control role, and for door breaching with #9 birdshot, shotgun slug
Shotgun slug
A shotgun slug is a heavy lead projectile, that may have pre-cut rifling, intended for use in a shotgun and often used for hunting large game. The first effective shotgun slug was introduced by Wilhelm Brenneke in 1898, and his design remains in use today...

s, and specialized breaching rounds. Less-lethal options also include the use of grenade launching cups, special launching cartridges and a less-lethal grenade.

There are a number of experimental rounds currently under development and consideration by the US military, including explosive rounds and stand-off breaching rounds, which could further improve the range and flexibility of the combat shotgun.

Method of operation

There are two primary modes of operation for combat shotguns, the pump action, and various semi-automatic
Semi-automatic shotgun
A semi-automatic shotgun is a form of shotgun that is able to fire a cartridge after every trigger squeeze, without any manual chambering of another round being required...

 designs, mostly gas operation and recoil operation
Recoil operation
Recoil operation is an operating mechanism used in locked-breech, autoloading firearms. As the name implies, these actions use the force of recoil to provide energy to cycle the action...

 designs. The SPAS-12
Franchi SPAS-12
The SPAS-12 is a combat shotgun that was manufactured by the Italian firearms company Franchi S.p.A. from 1979 to 2000. The SPAS-12 is a dual-mode shotgun, meaning it can be calibrated to cycle either semi-automatically or through pump-action. The SPAS-12 has sold well to military and police users...

, SPAS-15
Franchi SPAS-15
The SPAS-15 is a dual-mode 12 gauge combat shotgun manufactured by the Italian company Luigi Franchi S.p.A..-Design:The weapon is based on the SPAS-12, and has similar pump-action/semi-automatic firing modes. In semi-automatic mode a gas piston drives a bolt carrier and rotating bolt. In...

, and Benelli M3
Benelli M3
The Benelli M3 is a dual-mode shotgun designed and manufactured by Italian firearms manufacturer Benelli. The M3 holds a maximum of seven rounds and uses the proprietary Benelli semi-automatic system first showcased in the M1. The M3 is notable for allowing the user the choice of semi-automatic...

 shotguns, combine the two, offering pump action or, when the pump is locked forwards, autoloading operation. There have also been a few fully automatic shotguns
Automatic shotgun
An automatic shotgun is a form of shotgun that is able to fire cartridges continuously while the trigger is pressed, unlike semi-automatic weapons which require the user to depress the trigger for each projectile fired.- Design :...

 produced such as the AA-12.

The autoloading shotgun (semi or full automatic) offers a higher (theoretical) rate of fire than a pump shotgun, though controlling a heavy recoil
Recoil
Recoil is the backward momentum of a gun when it is discharged. In technical terms, the recoil caused by the gun exactly balances the forward momentum of the projectile and exhaust gasses, according to Newton's third law...

ing shotgun in rapid fire is difficult. The autoloading action is more suitable for firing from a prone position, as operation of a pump action moves the elbow normally used to support the shotgun, and it can more effectively be used one-handed, unlike pump actions which require two hands for effective cycling of the action.

The pump shotgun is more versatile than the semiautomatic, as it will more readily fire low powered less lethal munitions which lack sufficient pressure to cycle the action in an autoloading design. A pump shotgun, which does not rely on its ammunition for energy to cycle, operates normally with the lower powered ammunition, and provides utility in combat and riot control situations. In addition, the pump shotgun has an advantage in situations such as door breaching, where the shotgun is immediately dropped (retained by a sling) and replaced by another weapon after the door has been breached. By not cycling the action after firing the final breaching rounds (multiple rounds are often required) the pump shotgun is left without a loaded round in the chamber, unlike a semiautomatic shotgun.

Use in asymmetric warfare

Due to the widespread use of the shotgun as a sporting firearm, it is used in guerilla warfare and other forms of asymmetric warfare
Asymmetric warfare
Asymmetric warfare is war between belligerents whose relative military power differs significantly, or whose strategy or tactics differ significantly....

. Che Guevara
Che Guevara
Ernesto "Che" Guevara , commonly known as el Che or simply Che, was an Argentine Marxist revolutionary, physician, author, intellectual, guerrilla leader, diplomat and military theorist...

, in his 1961 book Guerrilla Warfare
Guerrilla Warfare (book)
Guerrilla Warfare is a book by Marxist revolutionary Che Guevara that was written right after the Cuban Revolution and published in 1961. It soon became the guidebook for thousands of insurgents in various countries around the world....

, notes that shotgun ammunition can be obtained by guerrillas even in times of war, and that shotguns loaded with heavy shot are highly effective against unarmored troop transport vehicles. He recommends that suburban guerrilla bands should be armed with easily concealable weapons, such as handgun
Handgun
A handgun is a firearm designed to be held and operated by one hand. This characteristic differentiates handguns as a general class of firearms from long guns such as rifles and shotguns ....

s and a sawed-off shotgun
Sawed-off shotgun
A sawed-off shotgun also called a sawn-off shotgun and a short-barreled shotgun , is a type of shotgun with a shorter gun barrel and often a shorter or absent stock....

 or carbine. Guevara also mentions an improvised weapon developed by guerrillas consisting of a sawed-off 16 gauge shotgun provided with a bipod to hold the barrel at a 45 degree angle. Called the "M-16", this was loaded with a blank cartridge
Blank (cartridge)
A blank is a type of cartridge for a firearm that contains gunpowder but no bullet or shot. When fired, the blank makes a flash and an explosive sound . Blanks are often used for simulation , training, and for signaling...

 formed by removing the shot from a standard shotshell. A wooden rod was then placed in the barrel, with a Molotov cocktail
Molotov cocktail
The Molotov cocktail, also known as the petrol bomb, gasoline bomb, Molotov bomb, fire bottle, fire bomb, or simply Molotov, is a generic name used for a variety of improvised incendiary weapons...

 attached to the front. This formed an improvised mortar
Mortar (weapon)
A mortar is an indirect fire weapon that fires explosive projectiles known as bombs at low velocities, short ranges, and high-arcing ballistic trajectories. It is typically muzzle-loading and has a barrel length less than 15 times its caliber....

 capable of firing the incendiary device accurately out to a range of 100 meters.

See also

Specific articles:
  • Armsel Striker
  • Auto Assault-12 Shotgun
    Atchisson Assault Shotgun
    The Auto Assault-12 , originally designed and known as the Atchisson Assault Shotgun, is a shotgun developed in 1972 by Maxwell Atchisson. The current 2005 version has been developed over 18 years since the patent was sold to Military Police Systems, Inc. The original design was the basis of...

     (AA-12)
  • Benelli M3
    Benelli M3
    The Benelli M3 is a dual-mode shotgun designed and manufactured by Italian firearms manufacturer Benelli. The M3 holds a maximum of seven rounds and uses the proprietary Benelli semi-automatic system first showcased in the M1. The M3 is notable for allowing the user the choice of semi-automatic...

    , a 12 gauge combat shotgun with switchable pump-action/semi-automatic firing modes
  • Benelli M1014
    Benelli M4 Super 90
    The Benelli M4 Super 90 is an Italian semi-automatic shotgun manufactured by Benelli Armi S.P.A.-History:On May 4, 1998, the U.S. Army Armaments Research, Development and Engineering Center at Picatinny Arsenal, NJ issued Solicitation #DAAE30-98-R-0401, requesting submissions for a new 12 gauge,...

    , a gas actuated semi-automatic which is the current "Joint Service Combat Shotgun", serving as a replacement for pump action models
  • Daewoo USAS-12
  • Franchi SPAS-12
    Franchi SPAS-12
    The SPAS-12 is a combat shotgun that was manufactured by the Italian firearms company Franchi S.p.A. from 1979 to 2000. The SPAS-12 is a dual-mode shotgun, meaning it can be calibrated to cycle either semi-automatically or through pump-action. The SPAS-12 has sold well to military and police users...

    , a 12 gauge combat shotgun with switchable pump-action/semi-automatic firing modes
  • Franchi SPAS-15
    Franchi SPAS-15
    The SPAS-15 is a dual-mode 12 gauge combat shotgun manufactured by the Italian company Luigi Franchi S.p.A..-Design:The weapon is based on the SPAS-12, and has similar pump-action/semi-automatic firing modes. In semi-automatic mode a gas piston drives a bolt carrier and rotating bolt. In...

    , a 12 gauge combat shotgun with magazine feeding
  • Heckler & Koch FABARM FP6
    Heckler & Koch FABARM FP6
    The Heckler & Koch Fabarm FP6 is a pump-action combat shotgun that was manufactured by the Italian firearms company Fabbrica Bresciana Armi S.p.A. and merchandised by Heckler & Koch...

    , 12 gauge pump action combat shotgun
  • Ithaca 37
    Ithaca 37
    The Ithaca 37 is a pump-action shotgun made in large numbers for the civilian, military, and police markets. It utilizes a novel combination ejection/loading port on the bottom of the gun which leaves the sides closed to the elements. In addition, the outline of the gun is clean...

    , 12 gauge pump-action shotgun used by U.S. Navy SEALS in Vietnam with duckbill attachment
  • KS-23
    KS-23
    The KS-23 is a Russian shotgun, although because it uses a rifled barrel it is officially designated by the Russian military as a carbine. KS stands for Karabin Spetsialniy, "Special Carbine"...

  • Mossberg 500
    Mossberg 500
    Mossberg 500 is a series of shotguns manufactured by O.F. Mossberg & Sons. The 500 series comprises widely varying models of hammerless, pump action repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, magazine capacity, and...

    , pump-action combat shotgun used by the United States Army and Marines
  • NeoStead 2000
    NeoStead 2000
    The NeoStead 2000 is a combat shotgun developed by Truvelo Armoury of South Africa.The NS2000 has been used in trial runs for a few years by special forces like the British SAS and there are hopes at NeoStead that larger weapons manufacturers will license the production rights...

    , used by the SAS
    Special Air Service
    Special Air Service or SAS is a corps of the British Army constituted on 31 May 1950. They are part of the United Kingdom Special Forces and have served as a model for the special forces of many other countries all over the world...

  • Pancor Jackhammer
    Pancor Jackhammer
    The Pancor Corporation Jackhammer is a 12-gauge, gas-operated automatic shotgun. It is one of very few fully automatic shotguns, and although patented in 1987, it never entered full-scale production. Only a few working prototypes of the Jackhammer were ever built; some sources state that only two...

  • Remington 870
    Remington 870
    The Remington Model 870 is a U.S.-made pump-action shotgun manufactured by Remington Arms Company, Inc. It is widely used by the public for sport shooting, hunting, and self-defense. It is also commonly used by law enforcement and military organizations worldwide.-Development:The Remington 870 was...

    —pump-action combat shotgun used by the Swiss Army for door and engine block breaching and the United States Air Force
    United States Air Force
    The United States Air Force is the aerial warfare service branch of the United States Armed Forces and one of the American uniformed services. Initially part of the United States Army, the USAF was formed as a separate branch of the military on September 18, 1947 under the National Security Act of...

     for air base/aircraft defense
  • Saiga-12
    Saiga-12
    The Saiga-12 is a Kalashnikov-pattern 12 gauge combat shotgun available in a wide range of configurations. Like the Kalashnikov rifle variants, it is a rotating bolt, gas-operated gun that feeds from a box magazine...

    —Russian gas operated semi-automatic shotgun based on the AK-74M
    AK-74
    The AK-74 is an assault rifle developed in the early 1970s in the Soviet Union as the replacement for the earlier AKM...

    , with a detachable magazine, in use by the Russian MVD (Ministry of Interior).
  • Special Operations Weapon
    Special Operations Weapon
    The Special Operations Weapon was a blow-forward operated, select fire shotgun used by US Navy SEALs in the Vietnam War. It was designed by Carroll Childers, an engineer at the Naval Special Weapons Center. The 870 mod kit provided SEAL shotgunners with a quick-change magazine holding 20 rounds...

    , 12 gauge full-automatic shotgun used by U.S. Navy SEALS in Vietnam
  • Winchester 1200
    Winchester 1200
    The Model 1200 and Model 1300 were two American pump-action shotguns that were manufactured by the Winchester-Western Division of Olin Corporation. It was produced in 12-, 16- and 20-gauge. The 1200 has the ability to have a bayonet fixed on the end of the barrel to be used in close quarter combat...

    , a 12 or 20 gauge pump-action shotgun
  • Winchester Model 1897
    Winchester Model 1897
    The Winchester Model 1897, also known as the Model 97, M97, or Trench Gun, was a pump-action shotgunwith an external hammer and tube magazine manufactured by the Winchester Repeating Arms Company. The Model 1897 was an evolution of the Winchester Model 1893 designed by John Browning. From 1897...

    —12 gauge pump-action exposed-hammer shotgun used from WW I through Korean War
  • Winchester Model 1912
    Winchester Model 1912
    The Winchester Model 1912 is a hammerless slide-action, i.e., pump-action, shotgun with an external tube magazine. Popularly-named the Perfect Repeater at its introduction, it largely set the standard for pump action shotguns over its 51 year high-rate production life...

    —12 gauge pump-action hammerless shotgun used from WW I through Vietnam
  • Zlatoust RB-12
    Zlatoust RB-12
    The RB-12 Bandaevskogo is a shotgun of Russian origin. The weapon is not automatic and comes with a folding stock. The gun is designed by Alexander G. Bandaevskiy, chief designer and president of JSC Uralmashproekt....

    , an Armenian magazine fed shotgun

General articles:
  • Automatic shotgun
    Automatic shotgun
    An automatic shotgun is a form of shotgun that is able to fire cartridges continuously while the trigger is pressed, unlike semi-automatic weapons which require the user to depress the trigger for each projectile fired.- Design :...

  • List of individual weapons of the U.S. Armed Forces (Shotguns)
  • List of shotguns
  • Riot shotgun
    Riot shotgun
    A riot shotgun is a shotgun designed or modified for use as a primarily defensive weapon, primarily by the use of a short barrel. The riot shotgun is used by military personnel for guard duty and was at one time used for riot control, and is commonly used as a patrol weapon by law enforcement...

  • Semi-automatic shotgun
    Semi-automatic shotgun
    A semi-automatic shotgun is a form of shotgun that is able to fire a cartridge after every trigger squeeze, without any manual chambering of another round being required...


Further reading

  • "Give Us More Shotguns!" by Bruce N. Canfield, American Rifleman
    American Rifleman
    American Rifleman is a United States-based monthly shooting and firearms interest publication, owned by the National Rifle Association...

    , May 2004
  • Bruce N. Canfield, A Collector's Guide to United States Combat Shotguns, Andrew Mowbray, 1992, ISBN 0-917218-53-1.
  • Fawcett, Bill. Hunters & Shooters, An Oral History of the U.S. Navy SEALS in Vietnam. New York: Avon Books, 1995. ISBN 0-380-72166-X, pp. 79–80, especially.

External links

The source of this article is wikipedia, the free encyclopedia.  The text of this article is licensed under the GFDL.
 
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