Nobody makes scope bases to fit as many guns as Weaver. Their precision built bases including the Weaver Top Mount Base for Remington 1187/870 (2007 and later) 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 Top Mount Base for Remington 1187/870 is a black 1 piece base.