Weaver Detachable Top-Mount Base 1 Piece Marlin/Mossberg/Western Field Standard Mount No. 63B Black

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.
No.63B mount
Specifications and Features:
1 piece aluminum detachable top mount base
Precision built
Square cut notch eliminates recoil
Black