Leupold steel standard (STD) rings and bases represent the most adaptable mounting system available in our product line. This particular model includes only the front dovetail and is intended to be machined to fit the firearm of your choice. You can combine the Gunmakers front dovetail base with the Gunmakers windage base (50033) or another Gunmakers dovetail base (50034) to complete your setup. It is an ideal option for standard calibers less than .300 Win Mag STD rings are available in five different heights and are precisely engineered to align with STD 1-piece or 2-piece bases. The front dovetail ring pivots, enabling lateral adjustment through the rear windage screws during bore sighting. Shims can also be utilized, preserving the scope's elevation adjustment for BDC (bullet drop compensation) dial applications. The connection between your scope and firearm is of utmost importance. Therefore, our mounts are as robust and reliable as the Leupold optics they support. With a wide array of mounting systems to choose from, you are certain to find the perfect match for your firearm and shooting style. Manufactured in the USA and guaranteed to withstand a lifetime of use, Leupold mounts will consistently perform without fail.