The Leupold steel standard bases and rings are the most versatile of any mounting system we offer. The rear ring is secured by windage adjustment screws, allowing the scope's internal adjustments to be reserved for precise sight-in. Additionally, shims can be used for gross elevation adjustment, reserving the scope's elevation adjustment for bullet drop compensation dial applications. Fits- Remington 700/721/725 (Right Hand, Long Action) (also BSA Monarch, Mossberg 1500/1700, Ruger M77 Round Receiver, S&W 1500 Rifle, & Tar Hunt RSG 12/20, Weatherby Mark V 2-pc) and Remington 40X.