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.
Browning BLR, front or rear
Colt Coltsman .223, .243 and .308 caliber round receiver, front or rear
Mossberg 810 and RM7, rear
Sauer SHR 970, front or rear
Western Field 730, rear
Winchester 52 with different hole spacing, rear; gunsmithing required
Winchester 61 octagon barrel, rear
This is only a single mount. You will need to order two mounts for mounting a scope.