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: CIL 871Ithaca Deerslayer ModelsRemington Models 740, 742, & 760Savage 170Smith & Wesson Model 41 Notes: This is a 1-piece baseMounting Hardware Included