Manufacturer: Weaver 48039
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.
Ithaca Lightning X3, front or rear
Colt Cotlsman .223, .243, .308 round receivers, front or rear
This is only a single mount. You will need to order two mounts for mounting a scope.