Midwest Industries MIAR30MB1 Muzzle Brake Black Phosphate Steel with 5/8-24 tpi Threads for 30 Cal AR-Platform”

Three chamber design significantly reduces muzzle rise. Constructed of tool steel with a phosphate finish. 5/8 – 24 threads for .30CAL / .300AAC rifles. Includes new crush washer. Made in the U.S.A.”