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:

• Mossberg Models 500 (1997 and after), 500A, 590, .835 Shotguns, & 835 

• Savage M320