Crafted from the durable 7075-T6 aluminum alloy, Leupold BackCountry cross-slot bases stand as a pinnacle of lightweight yet formidable mounts. In this iteration, the BackCountry cross-slot base is meticulously tailored to accommodate a Nosler M21 Long Action, capable of accommodating both Picatinny- and Weaver-style rings. In the realm of firearm accessories, few elements are as pivotal as the connection between your scope and weapon. This principle is upheld through mounts that mirror the sturdiness and reliability synonymous with Leupold optics. Spanning a diverse array of mounting systems, you're guaranteed to discover the optimal counterpart for your firearm and shooting preferences. Assembled in the United States and fortified to endure a lifetime of rugged usage, Leupold mounts stand resolute, consistently delivering the performance you depend on.