With this Gun Star UltraLow 60mm picatinny adapter/base, the picatinny rail lays flat against the receiver making it the world's lowest Blaser mount. It features recoil reduction, heat treated steel with a blued finish, and is guaranteed to return to zero after remount. This adapter has an ultra low mount, 5 picatinny recoil grooves, and is compatiable 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 60mm adapter/base for Blaser GS-Blaser-4