This 254mm Gun Star Super long Picatinny adapter/base features recoil resistance, heat treated steel with a blued finish, and is guaranteed to return to zero after remount. This adapter has 21 picatinny recoil grooves and is compatible with all firearms with a Blaser R93, R8, LRS2, K95, or S2 saddle mount system. Gun Star® We take pride in precision Gun Star Picatinny 254mm adapter/base for Blaser GS-Blaser-10