Browning X-Lock Integrated Scope Ring Mounts - Matte Blued - The X-Lock Integrated Scope Mounting System replaces the traditional two-screw system. The benefits are obvious, with the scope bases being secured at all four corners rather than only held at the center of the base, allowing for more accurate placement of the bases on the receiver. This revolutionary new X-Lock system holds the base tighter to the rifle than ever before. Fits all Browning X-Bolt Rifles 4 Screws Per Base Integrated Scope Mount Machined From 7000 Series Aluminum Made by Talley