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:Beretta Pintail Slug Gun front and rearBSA CF2 and Monarch Long Action 7mm, .270 and .30-06 frontChurchill Highlander frontColt Sauer front and rearEnfield receiver cut-down like Remington 721 frontHerters U9 round receiver frontLegacy Howa frontMossberg 100 ATR, 1500 and 1700 frontRaptor Arms frontRemington 700, 78, 40X-L, 721 and 725 Long Action frontRemington 700, 78, 40X-S, 722 and 725 Short Action frontRemington 700 muzzleloader frontSIG Sauer 200 front and rearShilen round receiver front and rearS&W 1500, 1600 and 1700 frontWeatherby Vanguard frontWeatherby Mark V Mag (not .240 mag) front