The American Precision Arms Gen 4 Steel Muzzle Brake for 6mm firearms is engineered to deliver superior performance with its innovative design. Featuring new calibrated U.R.P tunable top ports this muzzle brake offers unparalleled adjustability for the flattest shooting experience. Through meticulous testing of port size and location it effectively directs gas flow to eliminate vertical movement. Crafted from durable steel and designed with a 5/8"x24 thread pattern the Gen 4 Fat Bastard model stands out as a top choice for precision shooting enthusiasts seeking enhanced control and accuracy.