Audere Quarter Stroke Muzzle Brake .30 Cal 5/8''-24 Black. Made of high-grade steel and black nitride finished this series is specifically designed for auto and semi-auto weapons in order to guarantee an efficient reduction of both recoil and muzzle movements. Specifications for Audere Quarter Stroke Muzzle Brake .223 1/2x28 Matte Black: Manufacturer: Audere Color: Black Finish: Matte Features of Audere Quarter Stroke Muzzle Brake .223 1/2"-28 Matte Black Easy installation with the self-timing system Heavy reduction of recoil and muzzle movements Package Contents: Audere Quarter Stroke Muzzle Brake .223 1/2"-28 Matte Black Audere QS0011: Quarter Stroke Muzzle Brake .30 Cal 5/8''-24 Black