Each Weaver Top-Mount Scope 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:Anschutz 1568 (Rear), CIL-950 and 950-C (Rear) Ithaca Models LSA 55 LSA 65 (Front and Rear) Modern Muzzle Loading Models Knight Mk85 BK-92 T-Bolt (Flat receivers) (Front and rear)Sako Whitetail Hunter (Front and Rear) Savage Models 10, 12, 16, 510, 512, 516, (Short Action rifles) Striker Pistols, 110 (ES), 111, 112 (R, V FV), 116FSS (Long Actions), 210 Shtg (use X-High rings) (Rear) Shilen Flat top receiver (Front and rear) Stevens 110E (Rear)Tikka (flat receiver) (Front and Rear)