Weaver Detachable Top-Mount Base 1 Piece Marlin/Mossberg/Western Field Standard Mount No. 63B Black 48069
Each Weaver base is machined to the tightest tolerances for a custom fit. They are 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.
Fits: Marlin 9, 45, 30AS, 36, 62, 93, 336, 375 and 444, Marlin 1893/1894/1895, Glenfield 30, Zane Grey and Camp-9 Carbine, Marlin 922M and 989, Mossberg 640 and Western Field 740