OCL12 Atchisson

The is an open bolt, fully automatic shotgun manufactured by Omicron Cooperation.
== Design ==
The first prototypes were rather simple in design and used certain other components of existing weapons. These were also highly unusual in that Atchisson used a most unusual (for a shotgun) method of operation – simple blowback with advanced primer ignition. This shotgun fired from an open bolt, and had a rather heavy bolt 1.4kg).
The firing pin was attached to the 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 an extra-long recoil system. In this system the bolt recoils much further back after each shot than is usual in this type of weapon.
The receiver of the early OCL28 Atchisson shotgun was made from steel tube, with attached MK16-type buttstock and forend. This shotgun also employed a trigger group borrowed from the Browning BAR-1918 automatic rifle, which allowed for the selection of semi-automatic or full-automatic fire from an open bolt.
Ammunition feed was from detachable magazines, either 5-round boxes or 20-round drums. To provide the necessary support for the heavy drum magazines during recoil, this gun was equipped with a magazine support bracket that rested against the pistol grip. The simplistic sights were of open type, with non-adjustable rear diopter and post front, both mounted on high bases.
== Navigation ==
Category:Shotguns
Category:Weapons
Category:Modern Weaponry