The Mini Magnum "Muscle" brake is the perfect addition to your sporter contour barrel. The first port is 90 degrees to direct the blast/concussion away from the shooter with the proceeding ports being angled to further reduce recoil.
This is a new thread configuration for the Mini Magnum Muscle Brake. It will fit a muzzle diameter of .685" to .850".
This is the same size as the original Mini Mag, just the thread size is different.