The AMERICAN PRECISION ARMS Gen 4 Fat Bastard Self Timing Steel muzzle brake, designed for a 6mm platform, features 5/8"x24 threads and a precise 3.30" overall length with a 1.10" diameter to deliver enhanced control and reduced muzzle climb. The Gen 4 line introduces calibrated U.R.P tunable top ports, engineered for maximum adjustment to produce the flattest shooting brakes available, hands down; by testing port size, location, and how gas feeds into them, these tunable top ports are capable of generating zero vertical movement. Constructed in robust steel, this brake integrates seamlessly with compatible 6mm firearms while maintaining reliable performance under demanding shooting conditions. Its self-timing design simplifies installation and alignment, helping shooters achieve consistent recoil management and faster follow-up shots. Ideal for precision rifles and performance-minded shooters who value predictable muzzle behavior, the Fat Bastard combines rugged durability with advanced port geometry to optimize gas direction and recoil impulse. Whether zeroing, dialing in load development, or pushing for tighter groups, this brake is built to support accurate, controlled shooting moments.