The Leupold BackCountry bases are crafted with 7075-T6 aluminum making them among the lightest manufactured. These cross-slot bases are made to specifically fit a large selection of rifles and are compatible with both Picatinny and Weaver-style rings. The connection between your scope and firearm is the most important, which is why these mounts are built to be just as tough and reliable as any Leupold product. With an option of a 0 cant or 20 MOA cant, you’ll find the perfect fit for your shooting situation. Proudly made in the USA and built to withstand a lifetime of use, Leupold mounts are engineered for unwavering performance.