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A combat shotgun is a shotgun 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 provide increased hit probability unmatched by other small arms.

HistoryEdit

While the sporting shotgun traces its ancestry back to the fowling piece, which was a refinement of the smoothbore musket, the combat shotgun bears more kinship to the shorter blunderbuss. 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 loading smaller lead shot in combination with their larger bullets, a combination known as "buck and ball". The buck and ball load was used extensively by Americans at the Battle of New Orleans in 1814 and was partially responsible for the disparate casualty rates between American and British forces. The advantage of this loading was that it had a greater chance of hitting the enemy, thus taking wounded soldiers out of a fight. The disadvantage of this load was that the buckshot did not cause as severe wounds at longer ranges, and contemporary accounts show many of the British wounded recovering quickly as they had been struck by the buckshot rather than the ball. Fowling pieces were commonly used by militias, for example during the Texas Revolution. 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, often by cavalry units.[2] 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's pursuit of Pancho Villa, 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 hardened 00 buckshot, and equipped with a bayonet. The M1897 and M1912 also could be slam fired: the weapon having no trigger disconnector, 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.[3] The shotguns elicited 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. 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.[4]

A group of US Marines in Iraq in 2005, armed with a combat shotgun, assault rifle, and squad automatic weapon 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 shotguns 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.[2] Six different model of shotguns were accepted in the US army during World War II, the most popular being the M97 and M1912. 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. Some Marines carried the shells in SL-3 grenade vests from World War I, but these vests were hard to come by, also used were modified bandoliers and whatever came to hand or could be improvised. Another disadvantage was paper-hulled shotshells, 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 attempted to restrict the use of shotgun even though the shotgun had proven its worth amongst the Marines in the Pacific War during close combat in trench and jungle fighting. General Alexander Patch was seen being armed with a Winchester shotgun when he personally led an attack in Guadalcanal.[5] In the jungle warfare during the Malayan Emergency, the British Army and local forces of Malaysia used shotguns to great effect due to limited space in the jungles and frequent close combat. In the Vietnam War, the shotgun was used as an individual weapon in the American army during jungle patrol and urban warfare like the Tet Offensive. During the Somalian conflict in 1992, the US task forces tested out a new type of Remington shotgun called Ciener Ultimate Over/Under, which was an under-barrel attachment for the standard M16 variants during Operation Gothic Serpent. 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 to clear the room. According to the Army Rangers, their verdict was positive for this new type of breaching gun. In operations in post-invasion Iraq, US forces used their combat shotguns to clear out suspected insurgent hideouts in house to house fighting.[6] 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 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.

CharacteristicsEdit

The most common type of shotgun used for this purpose is the manually operated, slide-action/pump-action type like the Mossberg 590A1 which is currently the pump-action of choice for US armed forces and has seen service with other militaries, because it is less prone to malfunction (particularly when dirty) than semi-automatic designs. Pump-action shotguns are also less expensive than their semi-automatic counterparts. Even so, semi-automatic shotguns such as the Benelli M1014 are currently seeing service in NATO-aligned armed forces. Combat shotguns typically have much shorter barrels than shotguns used 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; but the military versions may have provisions to mount a bayonet 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 up to a 10-round capacity, while riot shotguns are often found with barrels of 35 to 46 cm (14 to 18 inches) and a capacity of 5 to 8 rounds.

EffectivenessEdit

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: Offensive weapon Breaching system 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; rifle 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).[citation needed] 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 in 2001.[7] When used as a door breaching 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.[8]

US soldiers in Tal Afar, Iraq, search for insurgents. Soldier in foreground is carrying a shotgun on a sling for breaching, and an assault rifle 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 design, like the Saiga-12), the tubular magazine is still dominant. This limits capacities; the current US pump shotgun issued, the Mossberg 590, 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.[9] A 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.[10] The bulk and weight of shotgun ammunition also limits its utility as a general-issue weapon. Weight per 100 rounds of an average 12 gauge 00 Buck 2-3/4" shell is 10.25 lbs; for an average .223/5.56 round, weight per 100 rounds is about 2.69 lbs or a 3.8:1 weight ratio of 12 gauge buckshot and 5.56×45mm.[11] This means just seven 12-gauge buckshot shells weigh approximately the same (.45 kilos/one pound) as thirty 5.56×45mm rifle cartridges. While an individual soldier can easily carry several hundred rifle or pistol cartridges in box magazines, only a few dozen shotshells can be carried practically.

AmmunitionEdit

The most common type of ammunition used in combat shotguns, whether for military or law enforcement purposes, is buckshot, typically a 70 mm (23⁄4 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.[2] The only other types of ammunition currently in use in military shotguns are breaching rounds, which are either specially designed frangible 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-materiel 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 ammunition has also been used in shotguns (primarily by special forces, such as its use by the SEALs in the Vietnam War),[13] but this is not common. Other experimental shotgun ammunition has been created, such as SCMITR, 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 slugs, 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.

OperationEdit

There are two primary modes of operation for combat shotguns, the pump action, and various semi-automatic designs, mostly gas operation and recoil operation designs. The SPAS-12, SPAS-15, and Benelli M3[14] 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 produced such as the AA-12 and Pancor Jackhammer. The autoloading shotgun (semi or full automatic) offers a higher (theoretical) rate of fire than a pump shotgun, though controlling a heavy recoiling 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 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.

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