Ruger Hybrid Muzzle Brake for 1/2-28 thread, designed for 350 Legend. Reduces recoil and muzzle rise, improving accuracy over a longer string of fire. Also reduces noise and debris by directing blast to the sides of the shooter. The brake is timed using the included crush washers (2) and installs quickly using a 7/8" box wrench or crescent wrench. Washers should be installed with the cupped side toward the muzzle. It is manufactured from 4140 chrome moly steel with a matte black finish. Fits rifles.