The Derya MK12 is an autoloading, box magazine-fed, AR-style shotgun. Its upper and lower receiver are constructed from 7075 T6 aluminum and it borrows many elements from the AR platform. It is gas-operated and can accept AR15 stocks and pistol grips. The MK12's fire controls are similar to that of an AR, with a push-button magazine release and bolt lock on the left side of the receiver. PowerPull Gas Operating System. DAXOS (Dual Axis Operation System). Aluminum Barrel Shroud with 3 Mobile Chokes.