Magnum Slimline Muzzle Brake Blue InstalledAvailable Installed with BLUE Finish or FRENCH GRAY (Blue is pictured above) These brakes feature a large expansion chamber that compresses muzzle gases so they’ll accelerate as they exit the ports. No ports on the bottom… no kicked up dust. Recoil is reduced approximately 42-45%... eliminates muzzle rise on chamberings up to 45 cal. Finished Blue or French Gray (FG). These fit muzzle diameters from .700 to .850 inch and add approx. 1" to barrel length. Threads are 5/8-28. This price includes our Precision Installation Process. Please use Work Order Form. See all of our muzzle brakes plus our installation process on our Muzzle Brake Home Page.Allow approx. 6-8 weeks for installation.