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.

No.45 mount

Fits:
Browning Mauser action
CIL 972-C
Colt 57
H&R 300, 301, 330 and 370 made before 1973
Herters J9
Interarms Viscount; shimming required
Marlin 455
Mauser with receiver ring 1.410"
Modern Muzzleloading LK-93, Wolverine and Legend
Modern Muzzleloading Disc and American round receiver, front or rear
Musgrave Mark III and IV
Parker-Hale 1000, 1000C, 1100, 1200 and 1700
Sears 50 and 51
Voere 2150, 2165/1-4 Mauser action
Weatherby FN Mauser actions

Note:
This is only a single mount. You will need to order two mounts for mounting a scope.