This Picatinny Rail base is engineered specifically for Browning X-Bolt rifles in 300 RUM and 300 PRC Ultra Magnum actions. Crafted from lightweight aluminum with a matte black finish, this 1.60 oz base features a 20 MOA cant/offset and an integrated bubble level anti-cant design. Compatible with Picatinny rail and Weaver mounts, it includes all mounting hardware to ensure rock-solid stability and precision. Safety Note Always ensure the firearm is unloaded before installing or adjusting any optics or bases. Verify proper torque specifications during installation. Improper mounting may affect accuracy and safety.