Leupold&';s BackCountry Scope Bases combine high-performance with a lightweight design. Precision machined from one solid piece of 7075-T6 aircraft grade aluminum, the BackCountry Scope Bases deliver a rock-solid interface between your optic and firearm, and are every bit as rugged and reliable as Leupold&';s premium optics. The BackCountry Scope Bases are available in a massive selection of options for specific rifles, and many feature an inclination to extend the elevation adjustment range on the mounted optic. Features: Precision machined from one solid piece of 7075-T6 aircraft grade aluminum Lightweight & Durable Available in a massive selection of options for specific rifles