The Leupold Standard Bases provide a strong, precise, and versatile foundation for your scope, ensuring rock-solid stability and long-term durability. Available in 1-piece and 2-piece configurations and designed to work with Leupold Standard rings, these bases offer a proven mounting solution for a wide range of popular rifles. The front base allows the dovetail ring to pivot, providing for lateral windage adjustment using the rear windage screws during bore sighting. Engineered with tight tolerances and crafted from solid steel, the Leupold STD bases maintain zero even under heavy recoil and the most rugged conditions. So, upgrade your mounting system with the durability and precision of Leupold Standard Bases trusted by shooters for generations.