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.
Mossberg 400, front
Remington 10, 11, 12, 34, 341, 510, 511 and 521T, front; gunsmithing required
This is only a single mount. You will need to order two mounts for mounting a scope.