Leupold BackCountry cross-slot bases are made of 7075-T6 aluminum, making them some of our lightest and most rugged mounts yet. This BackCountry cross-slot base is designed to fit a Browning X-Bolt 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 our mounts are every bit as rugged and dependable as the Leupold optics they secure.Specifications and Features: Material: Aluminum Base Cant: No Base Configuration: 1 Piece Weight (oz): 2.4 Base/Receiver Screw Torque: 22 in-lbs (18 on front two screws) Length (in): 6.6