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: - BSA Model Monarch Medium Action in 222 243 &l 308 (rear base ONLY) and CF2 Monarch Long Action in 7mm 270 & 30-06 (rear base only) - Churchill Highlander (rear base only) - Enfield receiver cut down like Remington 721 (rear base only) - H & R Models 317 and 322 (rear base only) - Herters U9 Round Receiver (rear base only) - Interarms Howa (rear base only) - Mossberg Models 1500 & 1700 (rear base only) - Raptor Arms -- Same as Remington 700 LA (rear base only) - Remington 700 & 78 LONG ACTION in 270 280 25-06 7mm Mag. 300 Win. Mag. 264 375 458 40X-L; 721; 725 in 270 280 30-06 and 375 (rear base only) - Remington 700 & 78 SHORT ACTION in 17 222 222 Mag. 22-250 243 6mm 308; 722; 40X-S; 725 in 222 243 244; 700 Muzzle Loader (rear base only) - Sauer 200 - SKS Smith & Wesson Models 1500 1600 and 1700 (rear base only) - Weatherby Vanguard (rear base only)