Leupold steel Standard (STD) rings and bases are among the most versatile mounting systems available. This model, specifically designed to fit a Mauser FN, is ideal for use with standard calibers under .300 Win. Mag. Comes in five different heights, the STD rings are precision-engineered to seamlessly align with either STD 1-piece or 2-piece bases. The front dovetail ring pivots, enabling lateral adjustment through the rear windage screws during bore sighting for a precise and reliable fit. Shims can also be applied to preserve the scope's elevation adjustments for BDC (bullet drop compensation) dial applications. Leupold understands the critical connection between your scope and firearm, which is why these mounts are crafted to be as rugged and dependable as the Leupold optics they support. With a variety of mounting systems to choose from, you'll find the perfect match for your firearm and shooting needs. Made in the USA and guaranteed to withstand a Lifetime of use, Leupold mounts are designed to endure even the most demanding conditions with reliable performance.