The Troy Industries Medieval Muzzle Brake is designed to reduce recoil and muzzle climb on AR-15 style rifles. Threaded for 1/2”x 28 tpi rifles in .223 Remington caliber. Constructed of heat-treated ordnance steel with a matte black finish – a crush washer is included. The muzzle brake features a pointed face that serves as an improvised breaching device. This brake is post ban compliant when permanently attached (pinned & welded over).