The American Precision Arms G4F5860S Gen 4 Fat Bastard Self Timing Brake is engineered for serious precision shooters who demand consistent recoil reduction and flat tracking. Machined from steel with a 1.10" diameter and 3.30" overall length, this Gen 4 muzzle brake uses a self-timing design that simplifies installation while maintaining secure, repeatable alignment on 5/8"x24 threaded barrels.

Calibrated U.R.P tunable top ports allow the shooter to fine-tune gas flow for their specific 6mm setup, helping to minimize or even eliminate vertical movement shot to shot. This makes the brake well suited for long-range target shooting, competition, and intensive training sessions where staying on target matters. The thoughtful port layout and American Precision Arms’ attention to machining detail reflect the brand’s reputation for innovation and refined craftsmanship in muzzle devices.

Key Features:

• Manufacturer: American Precision Arms
• Model: Gen 4 Fat Bastard Self Timing Brake
• Caliber: 6mm
• Thread Pattern: 5/8"x24
• Overall Length: 3.30"
• Diameter: 1.10"
• Material: Steel
• Unique Features: Self-timing design with calibrated U.R.P tunable top ports for reduced vertical movement