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Availability: In Stock
The Phase 5 Weapon Systems FATMAN556 Hex Brake is a precision muzzle brake engineered for AR-platform rifles in .223 Remington and 5.56 NATO. Built for shooters who demand flat recoil control and shot-to-shot consistency—whether you're dialing in a precision build, running competition stages, or pushing accuracy downrange—this brake combines serious performance with the custom-shop aesthetics that discerning gun builders demand.
The FATMAN design centers on two large, ventilated baffle sections that work together to manage recoil and compensate for muzzle rise. The top ports are machined at a 20-degree forward angle, directing expelled gas in a way that promotes repeatable, flat shooting behavior. This geometry keeps your sight picture stable shot after shot, a critical advantage when precision matters. The brake is engineered so its first chamber wall sits as close to the barrel crown as possible, preserving your barrel's inherent accuracy and minimizing any point-of-aim shift from the muzzle device itself.
Finished in mil-spec black parkerized steel, the FATMAN wears the iconic Phase 5 hex profile—a hallmark of quality custom builds. It threads on 1/2"-28 (standard for modern 5.56 uppers) and includes a crush washer for reliable installation. At 3 inches overall length, it's substantial enough to deliver real compensation without overhanging most handguards.
| Thread Pitch | 1/2"-28 |
| Caliber Compatibility | .223 Remington, 5.56 NATO |
| Overall Length | 3" |
| Finish | Mil-Spec Black Parkerized Steel |
| Platform | AR-Platform |
| Included Items | Crush washer |
Yes, the FATMAN556 threads on 1/2"-28, the standard thread pitch for modern .223/5.56 uppers. It will fit any AR-platform rifle with a 1/2"-28 barrel.
The FATMAN556 is designed for .223 Remington and 5.56 NATO ammunition fired from compatible AR-platform barrels with 1/2"-28 threading.
The FATMAN556 comes with one crush washer for installation. A gunsmith or armorer can install it for you, or you can do it yourself if you have the proper tools and knowledge of crush washer installation.
The design was engineered so the first chamber sits as close to the barrel crown as possible, helping preserve the barrel's accuracy and minimize zero shift caused by the muzzle device.
SKU: 115705052 • Width: 4.1in • Height: 1.5in • Depth: 6.1in • Weight: 0.5oz
Availability: In Stock
The Phase 5 Weapon Systems FATMAN556 Hex Brake is a precision muzzle brake engineered for AR-platform rifles in .223 Remington and 5.56 NATO. Built for shooters who demand flat recoil control and shot-to-shot consistency—whether you're dialing in a precision build, running competition stages, or pushing accuracy downrange—this brake combines serious performance with the custom-shop aesthetics that discerning gun builders demand.
The FATMAN design centers on two large, ventilated baffle sections that work together to manage recoil and compensate for muzzle rise. The top ports are machined at a 20-degree forward angle, directing expelled gas in a way that promotes repeatable, flat shooting behavior. This geometry keeps your sight picture stable shot after shot, a critical advantage when precision matters. The brake is engineered so its first chamber wall sits as close to the barrel crown as possible, preserving your barrel's inherent accuracy and minimizing any point-of-aim shift from the muzzle device itself.
Finished in mil-spec black parkerized steel, the FATMAN wears the iconic Phase 5 hex profile—a hallmark of quality custom builds. It threads on 1/2"-28 (standard for modern 5.56 uppers) and includes a crush washer for reliable installation. At 3 inches overall length, it's substantial enough to deliver real compensation without overhanging most handguards.
| Thread Pitch | 1/2"-28 |
| Caliber Compatibility | .223 Remington, 5.56 NATO |
| Overall Length | 3" |
| Finish | Mil-Spec Black Parkerized Steel |
| Platform | AR-Platform |
| Included Items | Crush washer |
Yes, the FATMAN556 threads on 1/2"-28, the standard thread pitch for modern .223/5.56 uppers. It will fit any AR-platform rifle with a 1/2"-28 barrel.
The FATMAN556 is designed for .223 Remington and 5.56 NATO ammunition fired from compatible AR-platform barrels with 1/2"-28 threading.
The FATMAN556 comes with one crush washer for installation. A gunsmith or armorer can install it for you, or you can do it yourself if you have the proper tools and knowledge of crush washer installation.
The design was engineered so the first chamber sits as close to the barrel crown as possible, helping preserve the barrel's accuracy and minimize zero shift caused by the muzzle device.
SKU: 115705052 • Width: 4.1in • Height: 1.5in • Depth: 6.1in • Weight: 0.5oz