Leupold BackCountry cross-slot bases are made of 7075-T6 aluminum, making them some of their lightest and most rugged mounts yet. This BackCountry cross-slot base is designed to fit a Browning X-Bolt 2 Long Action and accepts both Picatinny- and Weaver-style rings. Nothing is more crucial than the link between your scope and firearm. That's why their mounts are every bit as rugged and dependable as the Leupold optics they secure. RSR -