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: - Colt Coltsman in 223 (Sako Action)(Front) - Garcia 74 (Front) - H & R 317 before the 1975 Model (Front) - Sako Models Forester Finnbear & Vixen (Tapered Dovetail)(Front) - Savage 2400 (Front) - Tikka in the Sako design (Front) - Valmet Tapered Dovetail (Sako design)(Front) - Western Field 750 (Front)