Fostech Origin 12 is a mod that introduces the Fostech Origin 12 modern mag-fed shotgun to the game. the same Combat shotgun's stats apply. It is a semi-automatic magazine-fed combat/tactical shotgun, developed by Fostech Outdoors. It is based on the AK-47 action and is basically a heavily modified, modern version of Saiga-12. The weapon comes with unique 1st and 3rd person animations and custom sounds (except for firing sounds, which are vanilla). It also has a unique magazine layout.

There are 17 receivers, a standard grip, a unique left-hand type, 2 rail attachments, 2 grips, and 2 magazines. The weapon also has 2 sights, an Aimpoint, a laser sight, and an infrared sight. It has a flashlight and a laser.