Rear Base for: BSA Rear Mount: Monarch Medium Action in 222, 243, and 308; CF2; Monarch Long Action in 7mm, 270, and 30-06; Churchill Highlander; Enfield with receiver cut down like Remington 721; Herters U9 Round Receiver; Howa Howa; Mossberg 100 ATR, 1500, and 1700; Raptor Arms same as Remington 700 Long Action; Remington 700, 78, 40x-L, 721, 725 (all long actions); 700, 78, 40x-S, 722, 725 (all short actions); 700 muzzleloader; Smith & Wesson 1500, 1600, and 1700; Weatherby Vanguard, Mark V standard caliber including .240 mag, Centerfire pistol, 224 Varmintmaster, Ultra Lightweight.