American Precision Arms Gen 4 Fat Bastard Muzzle Brake, 6mm, Nitride

The American Precision Arms Gen 4 Fat Bastard (American Precision Arms part no. G4F5860N) steps up to a larger-diameter housing than the Little Bastard, built for 6mm-bore rifles and threaded 5/8×24 with a 3.30-inch overall length and a 1.10-inch outside diameter. The extra bulk gives the Fat Bastard more room for the same calibrated, tunable top-port design that defines the Gen 4 line, engineered for maximum adjustment to virtually eliminate vertical muzzle rise under recoil. A nitride finish protects the brake from corrosion through heavy round counts, making it a strong fit for 6mm competition and precision rifles pushing hot loads.

Key Specifications

• Built for 6mm-bore rifles.
• Threaded 5/8×24.
• Measures 3.30 inches overall with a 1.10-inch outside diameter.
• Uses a self-timing design so the brake indexes correctly without shims.
• Features calibrated, tunable top ports engineered to eliminate vertical muzzle rise.
• Finished in nitride for corrosion resistance.

Frequently Asked Questions

What bore size is this brake built for? 6mm.

How does the Fat Bastard differ from the Little Bastard? It uses a larger-diameter housing, 3.30 inches overall with a 1.10-inch outside diameter, versus the Little Bastard’s more compact size.

Buy the American Precision Arms Gen 4 Fat Bastard Muzzle Brake

Tame recoil on your 6mm precision build with a larger-format brake built for heavy round counts. See more from American Precision Arms or shop our full lineup of gun accessories and parts. Order it from our Lubbock, Texas gun shop for fast, insured shipping.