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. The Weaver 414M Base. Remington 597 Standard 1-Piece Detachable Top-Mount Base available in Matte Black. Fits Remington 597 and 597LSS and includes custom-hardened fastening screws for mounting.