The BipodeXt Proprietary Quick Detach Unimount System comes standard on all TAC III and TAC II models. It creates a rigid attachment point to the forend of a rifle by quickly attaching to a picatinny rail (It takes a minimum of a 13-slot Picatinny Rail or two individual rails). BipodeXt's ARCA Swiss style owners can now use their extension systems on Picatinny rails by ordering this mount. The BipodeXt Unimount is made in the USA from 6061 T6 Aluminum (COATING: U.S MIL-A8625, Type III, Class 2) Levers made of Steel.