Nobody makes scope bases to fit as many guns as Weaver. Their precision built bases including the Weaver Simmons 428 Top Mount Scope Bases are machined to tight tolerances for a custom fit, and fight the effects of recoil with a square cut notch that mates to the sturdy cross bolt in every Weaver detachable ring. Custom hardened fastening screws come with every Weaver base. The Weaver Simmons 428 Top Mount Scope Base is a high gloss black 2 piece base.