TriStar Raptor Synthetic Blued 20 Gauge 3in Semi Automatic Shotgun - 24in -The Raptor is a semi-automatic shotgun that allows you to shoot light target loads to heavy waterfowl loads. Removable choke system that uses Beretta Mobile threads includes three choke tubes (IC, M, F), choke box and choke wrench. Highly durable injection molded stock and forearm, stock has zero plane for better feel. Fiber optic sight and swivel studs standard with rubber recoil pad, backed by a five-year mechanical warranty. The shotgun is gas operated semi-automatic. The bolt remains open after last round is fired. If the magazine and chamber are both loaded, opening action will result in ejecting shell from chamber but will not cycling new shell from magazine into the chamber. The magazine cut-off is located near trigger guard and must be pushed to eject shell from magazine. This allows shooter to clear chamber but keep magazine loaded. This model features a 24in barrel, 3in Chmaber, and is 20 Gauge. Magazine cut-off Vent Rib with Matted Sight Plane Fiber Optic Sight 5 Round Magazine - Shot Plug Included Quick Shot Plug Removal Chrome-lined Chamber and Barrel Swivel Studs