Weaver 417M Top Mount One Piece Base - Matte Details

Each Weaver base is machined to the tightest tolerances for a custom fit. They are designed to fight the effects of recoil with a square-cut notch that precisely mates to the sturdy cross bolt in every Weaver detachable ring.Fits:Mossberg Models 500 (1997 and after), 500A, 590, .835 Shotguns, & 835Savage M320 Each Weaver base is machined to the tightest tolerances for a custom fit. They are designed to fight the effects of recoil with a square-cut notch that precisely mates to the sturdy cross bolt in every Weaver detachable ring. Fits: Mossberg Models 500 (1997 and after), 500A, 590, .835 Shotguns, & 835 Savage M320