Leupold LRW cross-slot rings are built from Strike Forged Steel made in America to deliver unmatched durability and strength. Leupold CNC machining ensures perfect alignment to Weaver-style bases and the anti-slip grooves eliminate the need of lapping. LRW ring screws with Nylok won’t back out under recoil or vibration. Recommended for mounting on firearms such as tactical shotguns with built-in mounting rails.