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: Anschutz 1568Beretta Mato Rifle (Front)Browning Models BLT, ACT, Hi Power, BBR LA/SACIL Models 950, 950C, & 972CColt 57Cooey 71H & R Models 300, 301LA, 330, & 370Herters J9High-Standard High-PowerMarlin 455Mauser Models 95, 98, 99, FN, ZB, & Bauer 3000/4000Musgrave Models Mark I-IVParker-Hale Models 1000, 1000C, 1100, 1200, & 1700Ruger American Savage Models 110, 110E, 110S, 111, 112R, 112V, 112FV, & 116FSSSears Models 50, 51, 51L, & 53Stevens 110EVoere Models 2150 and 2165/ 1-4Weatherby Models Mark 5 & FNWinchester Models 52 (Hole spacing the same, fits rear and front), 54, 70LA/SA, 670, 770 Notes: Fits Front sight for all of the above listings.Mounting Hardware Included.