Shop › MIDWEST MB TWO CHAMBER 1/2X28 MIDWEST MB TWO CHAMBER 1/2X28 $44.95 Midwest Industries Muzzle Brake, 2 Chamber, Black, 1/2X28, 223 Rem, 5.56MM MI-MB4 Quantity: Add To Cart Added! Midwest Industries Muzzle Brake, 2 Chamber, Black, 1/2X28, 223 Rem, 5.56MM MI-MB4