Browning 12534 X-Bolt Integrated Scope Mount System Burnt Bronze CerakoteBrowning's X Bolt Integrated Scope Mount System eliminates alignment problems and the possibility of a loose connection between the base and ring. To ensure the new X Bolt has the most stable mount possible, this system features an all new X Lock scope mounting system that uses four screws per base, replacing the traditional two screw system. The scope bases being secured at all four corners rather than only held at the center of the base enables more