The American Precision Arms Gen 4 Muzzle Brake for 30 caliber firearms offers unparalleled control and precision. Engineered with innovative calibrated U.R.P tunable top ports this muzzle brake allows for maximum adjustment ensuring the flattest shooting experience possible. Extensive testing on port size and location has led to a design that effectively eliminates vertical movement enhancing your shooting accuracy. Crafted from durable stainless steel the Gen 4 Fat Bastard model features a 5/8"x24 thread pattern making it a reliable and high-performance addition to your firearm.