Weaver Top Mount Base 63B Marlin 9, 45, 30AW/AS, Mossberg 640, Black - 48069. 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 baseFits:br- Marlin 9, 45, 30AS, 36, 62, 93, 336, 375 and 444br- Marlin 1893/1894/1895, Glenfield 30, Zane Grey and Camp-9 - Marlin 922M and 989br- Mossberg 640br- Western Field 740.
