Available for standard 5.56×45 threaded barrels” the Keymount Muzzle Brake is your gateway to silence. When you’re ready for peace and quiet use the Keymount brake to quickly attach your Sandman-L™” Sandman-S™” Sandman-K™ to your rifle. If you’re not quite ready to turn up the silence” you can still employ the finest brake on the market and experience a flatter shooting rifle with minimal concussion compared to traditional muzzle brakes.