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.419M mount

Specifications and Features:
Weaver Top-Mount No. 419M 47437
Precision built
Tight tolerances
Square cut notch
Aluminum
Matte Black

Fits:
Browning A-Bolt Shotgun - Front Base Only
Note: Rear Base No. 47M Sold Separately