Faxon Firearms144600065
Faxon Firearms Gunner Duty Series 5.56 Nato 12.5" Black Nitride 4150 Cmv$161.00
Availability: In Stock
The Faxon Firearms Gunner Duty Series 5.56 NATO 11.5" barrel is purpose-built for shooters who want a lightweight, suppressor-ready upper without compromise. At just 1.14 pounds, this short-barreled rifle barrel strips weight where it counts—up front—while the robust 4150 CMV steel and nitride finish deliver the durability you need for hard use, whether you're running a can long-term or shooting unsuppressed. The Gunner profile tapers from a government-spec shoulder behind the gas block to a clean shoulder at the muzzle, and the 1/2-28 thread is cut to full depth, meaning you get a complete shoulder seal for any suppressor you mount.
Faxon builds these barrels in-house and runs them through a rigorous gauntlet: stress relief, air-gauge validation, magnetic particle inspection, and individual headspace verification with precision custom gauges. That attention catches issues before they leave the shop. The 1:8 twist handles the full range of 5.56 ammunition, and the 11-degree target crown is cut to exacting tolerances to help you ring steel reliably. The mid-length gas system and .625 gas block diameter give you options for tuning your build without hunting for odd-sized components.
Whether you're assembling a suppressed close-quarters rifle, a lightweight SBR, or a truck gun that won't weigh you down, the Gunner Duty delivers real-world performance at genuine value. This is a barrel that earns its place in a quality build.
| Caliber | 5.56 NATO |
| Barrel Length | 11.5" |
| Barrel Profile | Gunner |
| Barrel Material | 4150 CMV |
| Barrel Type | Button Rifled |
| Twist Rate | 1:8 |
| Gas System | Mid-Length |
| Gas Block Diameter | .625" |
| Muzzle Thread | 1/2-28 |
| Barrel Extension | M4 |
| Inside Finish | Nitride |
| Outside Finish | Nitride (Black) |
| Weight | 1.14 lbs |
| Crown | 11-Degree Target Crown |
| Testing | Magnetic Particle Inspected, Headspace Verified |
Yes. The 1/2-28 muzzle thread is cut to full shoulder depth, which provides a complete seal surface for suppressor mounting. The Gunner Duty is specifically designed for long-term suppressed use.
This barrel is configured with a mid-length gas system and a .625" gas block diameter, which is the standard size for most AR-platform components.
The barrel has a 1:8 twist, which is the standard rate for 5.56 NATO and handles the full spectrum of ammunition weights reliably.
Each Faxon Gunner Duty barrel is stress-relieved, air-gauge tested, and individually headspace-verified using precision custom gauges. All barrels undergo magnetic particle inspection to catch internal defects before shipping.
SKU: 144600043 • Width: 3.3in • Height: 1.2in • Depth: 14.4in • Weight: 1.16oz
Availability: In Stock
The Faxon Firearms Gunner Duty Series 5.56 NATO 11.5" barrel is purpose-built for shooters who want a lightweight, suppressor-ready upper without compromise. At just 1.14 pounds, this short-barreled rifle barrel strips weight where it counts—up front—while the robust 4150 CMV steel and nitride finish deliver the durability you need for hard use, whether you're running a can long-term or shooting unsuppressed. The Gunner profile tapers from a government-spec shoulder behind the gas block to a clean shoulder at the muzzle, and the 1/2-28 thread is cut to full depth, meaning you get a complete shoulder seal for any suppressor you mount.
Faxon builds these barrels in-house and runs them through a rigorous gauntlet: stress relief, air-gauge validation, magnetic particle inspection, and individual headspace verification with precision custom gauges. That attention catches issues before they leave the shop. The 1:8 twist handles the full range of 5.56 ammunition, and the 11-degree target crown is cut to exacting tolerances to help you ring steel reliably. The mid-length gas system and .625 gas block diameter give you options for tuning your build without hunting for odd-sized components.
Whether you're assembling a suppressed close-quarters rifle, a lightweight SBR, or a truck gun that won't weigh you down, the Gunner Duty delivers real-world performance at genuine value. This is a barrel that earns its place in a quality build.
| Caliber | 5.56 NATO |
| Barrel Length | 11.5" |
| Barrel Profile | Gunner |
| Barrel Material | 4150 CMV |
| Barrel Type | Button Rifled |
| Twist Rate | 1:8 |
| Gas System | Mid-Length |
| Gas Block Diameter | .625" |
| Muzzle Thread | 1/2-28 |
| Barrel Extension | M4 |
| Inside Finish | Nitride |
| Outside Finish | Nitride (Black) |
| Weight | 1.14 lbs |
| Crown | 11-Degree Target Crown |
| Testing | Magnetic Particle Inspected, Headspace Verified |
Yes. The 1/2-28 muzzle thread is cut to full shoulder depth, which provides a complete seal surface for suppressor mounting. The Gunner Duty is specifically designed for long-term suppressed use.
This barrel is configured with a mid-length gas system and a .625" gas block diameter, which is the standard size for most AR-platform components.
The barrel has a 1:8 twist, which is the standard rate for 5.56 NATO and handles the full spectrum of ammunition weights reliably.
Each Faxon Gunner Duty barrel is stress-relieved, air-gauge tested, and individually headspace-verified using precision custom gauges. All barrels undergo magnetic particle inspection to catch internal defects before shipping.
SKU: 144600043 • Width: 3.3in • Height: 1.2in • Depth: 14.4in • Weight: 1.16oz