Leupold steel Standard (STD) rings and bases represent the most versatile mounting systems available, engineered for reliable performance and support for your optics. This specific model is designed to fit the Springfield 1903 A3, making it an excellent choice for standard calibers under .300 Win. Mag. The STD rings are offered in five different heights, ensuring a precise and customizable fit when paired with either STD 1-piece or 2-piece bases. One of the key features of these rings is the front dovetail ring, which pivots to allow for lateral adjustments using the rear windage screws during bore sighting. Additionally, shims can be used to preserve the scope's elevation adjustment for BDC (bullet drop compensation) dial applications, enhancing your overall shooting accuracy. The connection between your scope and firearm is essential, which is why Leupold mounts are built to be as rugged and dependable as the optics they secure. With a wide variety of mounting systems to choose from, you're sure to find the perfect match for your firearm and shooting style. Proudly made in the USA and designed to withstand a lifetime of use, Leupold mounts are guaranteed to deliver consistent performance and reliability, ensuring you never miss a shot.