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: Remington Models 4, 6, 74, 76, 7400, & 7600Savage 67Benelli M1 Super 90 Notes: This is a 1-piece baseMounting Hardware Included