Weaver 48503 Base #53 Top Mount Scope Base is machined to tight tolerances for a custom fit

Designed to fight the effects of recoil with a square-cut notch that precisely mates to the sturdy cross bolt in every Weaver

Aluminum base offers maximum strength for rings to hold tight

Custom hardened fastening screws come with every Weaver base

1-piece top mount base for 2-piece system

Material: aluminum