Weaver's precision-built all steel bases are machined to tight tolerances for a custom fit and a square-cut notch mates to the sturdy cross bolt in every Weaver Detachable ring. Custom hardened fastening screws included. - Fits: - Browning Models Bolt Action Hi-Power other calibers(older models) Mauser Actions & BBR LA/SA (Front base ONLY) - Cil Models 950 950-C & 972-C - Colt 57 - Cooey 71 (Front base ONLY.) - Enfield receiver cut down like a Winchester 70 (Front base ONLY.) - H & R Models 300 301 330 370 before 1973; 300 301 LA - 1973 and after (270 30-06 7mm 300 Winchester) - Herters J9 - Interarms Viscount - Marlin Models 455 & MR7 - Mauser Models 98FN Swedish 96 & Bauer 3000 and 4000 - Musgrave Models Mark I-IV - Navy Arms Country Boy Muzzle Loader - Savage (Round Top Receiver) Models 10 12 16 510 512 516 SA Rifle 110 (E & S) 111 112 (R V & FV) 116FSS (LA); 210 Shotgun; Striker Pistol - Schultz & Larsen - Sears Models 50 51 51L & 53 - Stevens 110E - Voere Models 2150 2165/1 2165/2 2165/3 & 2165/4 (Mauser action) - Weatherby Models with FN Mauser actions - Winchester Models 52(hole spacing same); 70 LA(hole spacing same & Different); 300 Magnum 70 Super Express 670 & 770 (Front base ONLY.)