automatic shotgun

Automatic shotguns generally employ mechanisms very similar to other kinds of automatic weapons. There are several methods of operation, with the most common being gas, recoil, and blowback operated:

• File:Gas-operated firearm unifilar drawing.pngGas operation uses the pressure of the gas (created by the burning propellant) behind the projectile to unlock the bolt assembly and then move it rearward.
• Blowback operation uses the backward force applied by the projectile (due to Newton's third law of motion) to retract the bolt assembly.
• Recoil operation uses the backward force to retract the entire barrel and bolt assembly, which unlock at the rear of the barrel's path.

Each of these methods use springs to return the retracted parts to their forward positions and restart the cycle.{{cite web|last=Watson|first=Stephanie|title=How Machine Guns Work|url=http://science.howstuffworks.com/machine-gun.htm|publisher=howstuffworks|accessdate=February 14, 2012|author2=Tom Harris|date=16 October 2001}}

Many automatic shotguns are capable of selective fire, meaning they can fire in multiple modes (semi-automatic, burst, and sometimes fully automatic).

File:Shotgun shell comparison.jpg

They generally store ammunition in detachable box or drum magazines in order to decrease reloading time, whereas most pump-action and semi-automatic shotguns use under-barrel tubular magazines.

Automatic shotgun ammunition choices are slightly limited because the fired shot must provide sufficient recoil energy to reliably cycle the action. This means they are not compatible for use with low powered rounds, e.g. less-than-lethal ammunition. The most common shotgun shell used in combat shotguns contains 00 buckshot, 8 to 10 lead balls, which is very effective against unarmored targets.

A standard shotgun shot fires multiple small projectiles at once, increasing the chances of hitting the target. Shotguns have a short effective range of about {{convert|50|-|70|m}}, but provide a lot of firepower at close range.{{cite web|last=Popenker|first=Maxim|title=Modern Firearms — Shotguns|url=http://world.guns.ru/shotgun/shotgun-e.html|accessdate=February 9, 2012}} Automatic fire enhances these effects, due to the increase in the rate of fire.

File:Hunter with a shotgun on a dune at Curnic, Guissény, Finistère, France, 2010-02-21.jpg

Automatics typically have much shorter barrels than pump-action shotguns (especially hunting shotguns).{{cite book|last=Brooks|first=Adam|title=Ryan's Ballistic Trauma: A Practical Guide|year=2010|publisher=Springer|isbn=978-1-84882-123-1|url=https://books.google.com/books?id=UHhKhIxh6CAC&pg=PA23|edition=3|author2=Peter Mahoney|page=33}} Short-barreled shotguns have a very high chance of hitting close range targets, and can even hit multiple targets in one area, which is ideal for close combat situations.{{Cite book |last=Dougherty |first=Martin J. |url=https://books.google.com/books?id=-TsQz87h4r8C&dq=Short-barreled+shotguns++can+hit+multiple+targets+in+one+area&pg=PT345 |title=Unarmed Combat: Hand-to-hand fighting skills from the world's most elite fighting units (SAS and Elite Forces Guide) |date=2010 |publisher=Amber Books Ltd |isbn=978-1-908696-04-5 |language=en}} Long-barreled guns as long pump action shotguns are more accurate and have increased range, which is ideal for hunting and sporting purposes.{{Cite book |last1=Pirelli |first1=Gianni |url=https://books.google.com/books?id=XlByDwAAQBAJ&dq=Long-barreled+pump+action+shotguns+are+ideal+for+hunting+and+sporting+purposes&pg=PA32 |title=The Behavioral Science of Firearms: A Mental Health Perspective on Guns, Suicide, and Violence |last2=Wechsler |first2=Hayley |last3=Cramer |first3=Robert J. |date=2018-10-18 |publisher=Oxford University Press |isbn=978-0-19-063044-7 |language=en}}

Automatic shotguns are generally viewed as less reliable than manual operation shotguns, because there are more moving parts and increased chances of error.{{cite web|last=Coustan|first=Dave|title=How Shotguns Work|date=19 May 2005|url=http://www.howstuffworks.com/shotgun7.htm|accessdate=February 9, 2012}} If any one piece fails, it will most likely halt the operation and cause damage to the weapon and/or user{{Citation needed|date=April 2023}}. Automatic weapons are also more susceptible to jamming{{Cite book |last=Sobieck |first=Benjamin |url=https://books.google.com/books?id=PCFjDwAAQBAJ&dq=Automatic+weapons+are+more+susceptible+to+jamming&pg=PT56 |title=The Writer's Guide to Weapons: A Practical Reference for Using Firearms and Knives in Fiction |date=2014-12-03 |publisher=Penguin |isbn=978-1-59963-819-5 |language=en}} and negative effects from dirtiness{{Citation needed|date=April 2023}}.

File:Polícia Militar in Avenida Paulista 2.jpg

Automatic shotguns are intended for use as military combat shotguns. They typically have a high rate of fire and relatively low recoil, making them ideal for engaging targets in a fast-paced, close range combat situation. They are able to fulfill many different combat roles due to the wide variety of shotgun ammunition available.{{cite web|last=Morgan|first=Ryan|title=The tactical shotgun in urban operations|url=http://findarticles.com/p/articles/mi_m0IAV/is_6_93/ai_n16346115/|publisher=Infantry Magazine|accessdate=February 14, 2012}}

Automatic shotguns have not seen much use in the United States, but have been slightly more popular in some other countries.{{cite web|last=Popenker|first=Max|title=USAS-12 shotgun|date=27 October 2010|url=http://world.guns.ru/shotgun/usa/usas-12-e.html|accessdate=February 14, 2012}}

• AAI CAWS
• Atchisson AA-12
• Daewoo USAS-12
• FAS-173
• Gordon CSWS
• Heckler & Koch HK CAWS
• LW-3
• Pancor Jackhammer
• Saiga-12 (if converted to fully automatic fire)
• Smith & Wesson AS-3
• Remington 7188
• Vepr-12 (when converted to full auto)

• Combat shotgun
• List of combat shotguns
• List of shotguns
• Riot shotgun
• Semi-automatic shotgun

{{reflist}}

{{Firearms}}

Category:Paramilitary weapons