The American Precision Arms Gen 4 Fat Bastard 6.5mm Muzzle Brake features innovative tunable top ports for unparalleled shooting stability. Designed to offer zero vertical movement this muzzle brake incorporates advanced calibrated U.R.P technology to ensure precision performance. Its nitride finish enhances durability while the 5/8"x24 thread pattern ensures compatibility with a variety of firearm models. Experience the ultimate in recoil management and shooting accuracy with this cutting-edge muzzle brake.