Faxon Firearms Gunner Duty Series 5.56 Nato 11.5" Black Nitride 4150 Cmv

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.

Key Features

• Lightweight at 1.14 lbs—ideal for short-barreled rifle builds and suppressed systems
• 4150 CMV steel with nitride finish inside and out for corrosion resistance and durability
• 1/2-28 muzzle thread with full shoulder for secure suppressor seating
• Gunner profile—government-spec behind the gas block, tapered for weight savings
• 11-degree target crown for consistent accuracy
• Mid-length gas system with .625 gas block diameter
• Individually headspace-verified and magnetic particle inspected
• 1:8 twist accommodates a full range of 5.56 NATO loads
• Manufactured in-house with stress relief and air-gauge testing

Specifications

Frequently Asked Questions

Is this barrel suppressor-ready?

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.

What gas system does this barrel have?

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.

What twist rate is this barrel?

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.

How does Faxon verify barrel quality?

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.