The SDS S12 is an AK platform, semi-automatic, shotgun. Chambered in 12 Gauge with a 3" chamber this shotgun features all your favorites from the AK platform. A 4 position adjustable gas system, right side charging handle, AK enhanced safety and a 19" threaded barrel. The SDS S12 accepts saiga pattern magazines, accepts AK pattern grips and stocks and a Bulgarian pattern side optic rail.Features :"19" Threaded Barrel, Chrome-Lined, 3" Chamber,Right Side Charging HandleManual Bolt Hold Open Button4 Position Adjustable Gas SystemAK Enhanced SafetyV Notch Rear Sight, Bead Front, M1913 Rail on Dust CoverUtilizes Saiga Pattern MagazinesAccepts AK Pattern Grips and StocksM22 x 0.75 RH Threaded Barrel