Hers one for you Flash...I recall you having an admisration of shotguns or a discussion on them.One of the  latest additons to US Arsenal. Supposledy made of 7 types of steel, never needs cleanin(yes, said never) and has something like over 40 different types of rounds it can fire, including grenade shells... extremely accurate and has an innovative firing mechanism that removes recoil and displaces it to the the bottom of the  rifle instead of throough it...Agaian, featured on Futureweapons

 

 

 

Current production AA-12 shotguns
image: Soldier of Fortune magazine

	Atchisson assault shotgun, 1972	AA-12, 2006
Type	selective fire, blowback operated	selective fire, gas operated, locked breech
Gauge	12 (2 3/4" Magnum)	12 (2 3/4" Magnum)
Length	991 mm	966 mm
Barrel length	457 mm	457 mm
Weight	5.2 kg less magazine 7.3 kg with loaded 20-round drum	4.76 kg less magazine
Capacity	5 rounds in box or 20 rounds in drum magazines	8 rounds in box or 20 rounds in drum magazines
Rate of fire, cyclic	360 rounds per minute	rounds per minute

American gun designer Maxwell Atchisson developed his first selective fire shotgun by 1972. This weapon was intended for close combat in environments like city streets or jungles. It was to provide tremendous short range firepower for troops during ambushes, room clearance operations and other such combat situations. First prototypes were rather simple in design and used certain components of existing weapons. These were also highly unusual in that Atchisson used most unusual (for shotgun) method of operation - simple blowback with advanced primer ignition. This shotgun fired from open bolt, and had rather heavy (1,4kg) bolt. Firing pin was movably built into bolt along with the internal pivot lever that caused the firing pin to extend and ignite the cartridge just prior to full bolt closure. To reduce peak recoil and cyclic rate of fire, Atchisson used extra-long recoil system, in which bolt after each shot recoils much further back than it is usually required to reload the weapon. Receiver of early Atchisson shotgun was made from steel tube, with attached M16-type buttstock and forearm. This shotgun also employed trigger group borrowed from Browning BAR-1918 automatic rifle, which allowed for selective semi-automatic of full-automatic fire from open bolt. Feeding was from detachable magazines, either 5-round boxes or 20-round drums. To provide necessary support for heavy drum magazines during recoil, gun was equipped with magazine support bracket that rested against pistol grip. Simple sights were of open type, with non-adjustable rear diopter and post front, both mounted on high bases.