Leupold`s QR mounts allow you to remove and reattach your scope and return to within 1/2 in. of the original point-of-impact. The patented lever mechanism, machined with precision tolerances, engages the steel base to the ring, pulling it down and forward and locking it into its zero position. You get ease, convenience, and field-proven, repeatable accuracy.Fits:BSA: Monarch (Short Action)Mossberg: ATR (Short Action), 1500 (Short Action), 1700 (Short Action)Remington: 7, 7 (new model), 40X (Short Action), 673 Guide Rifle, 700 (Right Hand, Short Action), 721 (Right Hand, Short Action), 725 (Right Hand, Short Action), 700 Muzzleloader, XP-100, XP-100 R (new model with four mounting holes)H S Precision: Pro-Series 2000 VP (Varmint Pistol), Pro-Series 2000 SP (Silhouette Pistol).