This Midwest Industries .30 Caliber Muzzle Brake is designed for .308 and .300 AAC Blackout rifles but is also capable of fitting any .30 Caliber rifle with a 5/8 x 24 threaded barrel. The MI-30MB1 muzzle brake is designed to give a maximum reduction in felt recoil as well as muzzle rise allowing for quick, and accurate follow-up shots. This muzzle brake is made from tool steel with a tough phosphate finish to last a lifetime. Features: 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 100% made in the U.S.A. Lifetime Warranty Shop Palmetto State Armory for the widest selection of Modern Sporting Rifle parts and accessories at the best prices around!