Dove Custom Muzzle Brakes are manufactured in our machine shop and designed for maximum recoil reduction. The 4:3 interval hole design we use in our brakes allows for all possible gas to be released, and lets the shooter feel substantially less recoil. Our brakes are made from stainless steel and come with a "bead blasted" finish. This specific brake is designed to fit any .30 caliber rifle with a 5/8 x 24 threads per inch barrel.