The Midwest Industries MI-MB4 is a precision-engineered 2-chamber muzzle brake designed specifically for AR-15 rifles chambered in .223/5.56 caliber.Midwest Industries MI-MB4 2-Chamber Muzzle BrakeCompatible with AR-15 platform riflesChambered for .223/5.56 ammunition1/2x28 thread pitch for standard AR-15 barrels2-chamber design for effective recoil reductionUPC: 816537018704This muzzle brake helps reduce felt recoil and muzzle rise improving follow-up shot accuracy and overall shooting performance for competitive shooters hunters and tactical applications.