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.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