This 184mm Gun Star Picatinny adapter/base features recoil resistance, heat treated steel with a blued finish, and is guaranteed to return to zero after remount. This base has a very low mount, 14 picatinny recoil grooves, and is compatible with all firearms with a Blaser R93, R8, LRS2, K95, or S2 saddle mount. Gun Star Picatinny 184mm adapter/base for Blaser GS-Blaser-8