Faxon 5.56 NATO 20" Gunner Barrel

Faxon 5.56 NATO 20″ Gunner Barrel

11-degree target crown, MPI Inspected

The Faxon 5.56 NATO 20″ Gunner Barrel delivers exceptional accuracy and balance, making it ideal for shooters seeking enhanced performance from a full-length AR15 platform. Crafted from 4150 Chrome Moly Vanadium (CMV) steel, this barrel is finished with a QPQ Nitride coating to maximize corrosion resistance, surface hardness, and longevity. It also includes an M4 feed ramp extension for reliable cycling in a wide range of configurations.

Manufactured 100% in-house using high-quality gun-barrel-grade bar stock, Faxon applies a series of quality assurance checks, including MPI inspection and precise headspacing using custom hardened gauges. Each barrel is held to strict tolerances to ensure premium performance out of the box. The 20″ length, combined with a Rifle-length gas system, delivers softer recoil impulses, superior gas efficiency, and increased velocity.

What makes the Gunner profile unique?

The Gunner profile combines the proven durability of the Government profile at the rear of the barrel with the lightweight handling of the Pencil profile at the front. From the barrel extension to the gas block journal, you get the rigidity needed for consistent performance. Beyond the gas block, the barrel tapers to a thinner front end, reducing forward weight. This shift in balance brings the rifle’s center of gravity closer to the shooter, improving handling, reducing fatigue, and enhancing control during rapid or prolonged fire.

Whether you’re building a precision SPR-style rifle or want maximum performance for target shooting or competition, the Faxon 5.56 NATO 20″ Gunner Barrel is engineered to provide the perfect balance of accuracy, strength, and weight savings.

Barrel Features:

• 4150 CMV Steel – Military-grade strength and heat resistance
• QPQ Nitride Finish – Exceptional corrosion and wear resistance
• Rifle-Length Gas System – Smooth recoil and optimal dwell time
• 0.625″ Gas Block Journal – Compatible with standard low-profile gas blocks
• Gunner Profile – Balanced weight distribution with improved handling
• M4 Feed Ramp Extension – Improved reliability with various ammo types
• 11-Degree Target Crown – Maximizes muzzle accuracy
• MPI Inspected and Precision Headspace Checked

Technical Specifications:

• Caliber: 5.56 NATO
• Barrel Length: 20″
• Material: 4150 CMV Steel
• Finish: QPQ Salt Bath Nitride
• Twist Rate: 1:8 RH
• Gas System: Rifle-Length
• Gas Block Journal: 0.625″
• Profile: Gunner
• Feed Ramps: M4 Extension
• Crown: 11-Degree Target Crown
• Rifling: Button Rifled

If you’re looking to build or upgrade a full-length AR15 with a high-performance barrel that won’t weigh you down, the Faxon 5.56 NATO 20″ Gunner Barrel is a smart, battle-proven choice. We are always here to help!