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: Browning 1885 (Rear)Enfield (cut like Remington 30) (Front and Rear)H&R 317 & 322 (Rear)Mossberg 810 & RM7 (Front)Remington 30 (Front & Rear)Savage 40 & 45 (Front & Rear)Western Field 730 (Front) Notes: 1-piece base for a 2-piece systemMounting Hardware IncludedFor the Browning 1885 this base may require modification to fit