Weaver's Top Mount Base is machined to tight tolerances for a custom fit. It offers maximum strength for rings to hold tight and is constructed of aluminum. Fits Anschutz; Browning Long and Short action; Churchill 950/950C; Cooey 71; Savage A17/Axis/22/10-16 Short Action/110-116 Long Action/10-12, 110-114 LA w/AccuTrigger/ Stevens 200/10-14, 110-112 SA w/AccuTrigger/10 ML; Sears 53; Stevens 110E; Thompson Center Venture; Winchester 52/70/70.