Nobody makes bases to fit as many guns as Weaver. Yet each base is machined to tight tolerances for a custom fit. They're 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. Custom hardened fastening screws come with every Weaver base.

Fits:
Mossberg 25, 26, 42, 46M, 140, 142 and 146, front
Mossberg 45 and 46 with 3/4" barrels, front
Remington 12A and 121 with 3/4" barrels, front
Remington 33, front; requires gunsmithingSavage 4 and 5, front
Stevens 56 and 66, front
Winchester 57 and 69, front
Winchester 61 round barrel, front