The Fostech Origin 12 is an AK-derived shotgun chambered in 12 gauge. Although similar to the Saiga shotguns in terms of receiver design and bolt group, it must be noted that it uses different components designed from the ground up.
Primarily developed for use in civilian shooting sports (such as IPSC or 3-Gun), it has gained a reputation for being the fastest-firing semi-automatic shotgun.
The Origin 12 is a gas-operated, semi-automatic weapon with dual gas ports located ahead of the chamber and connected with a gas block with two gas tubes running forward above the barrel for about 10 cm (4”). At the gas block, powder gases are “turned back” to push on the traditional long-stroke gas piston, and a manual gas regulator is provided to adjust the gun for a wide variety of loads. The barrel and gas block are designed as a quickly detachable unit, allowing for fast and simple changes of barrel lengths and, possibly, calibers.
The weapon features a Saiga-12 style receiver made of steel, along with a Saiga-12 style bolt group with a rotary bolt. The Origin 12 feeds from 5-, 8-, or 10-round magazines, or from 20- or 30-round drums. It also features a side-folding, adjustable stock and rifle-type iron sights, mounted on the top Picatinny rail.
- The Origin 12 has made an appearance in Tom Clancy's Rainbow Six: Siege. It was renamed as the FO-12 shotgun, most likely done to avoid copyright. It is used by the Polish CTU in-game.