The Faxon Gov’t/Socom Duty Series Barrel (brand part number 15A58C10NSQ) is a 10.5-inch, 5.56 NATO AR-15 barrel manufactured in-house from 4150 chrome moly vanadium steel and finished in Black Nitride. Faxon builds every barrel in this line to be fully stress relieved and air-gauge tested, then cuts an 11-degree target crown to protect accuracy at the muzzle. Each barrel goes through a battery of tests at every stage of manufacturing and is individually checked for correct headspace using precision, custom-hardened gauges before it ships. Cut with a 1-in-8 twist rate, this barrel is a popular choice for a compact SBR or pistol-length AR-15 build running standard-weight to heavier 5.56 bullets.

Key Specifications

• Chambered in 5.56x45mm NATO/.223 Remington.
• Barrel length is 10.5 inches.
• Rifling twist rate is 1-in-8 inches.
• Machined from 4150 chrome moly vanadium (CMV) steel.
• Finished in Black Nitride for corrosion and wear resistance.
• Stress relieved and air-gauge tested for accuracy and durability.
• Cut with an 11-degree target crown to protect muzzle accuracy.
• Individually checked for headspace using precision custom-hardened gauges.
• Ships without sights, like most bare AR-15 barrels, leaving optic or iron-sight choice to the builder.

Frequently Asked Questions

Is it legal to buy a 10.5-inch barrel without paperwork? Yes, this barrel by itself is an ordinary Title I part. Federal law restricts installation, not purchase: pairing it with a shouldered, rifle-configured lower that is not registered as a Short-Barreled Rifle would create an illegal, unregistered SBR, so it must go on a pistol-configured lower or a properly registered SBR lower.

What twist rate does this barrel use? 1-in-8 inches, a versatile twist for standard-weight to heavier 5.56 bullets.

What steel is this barrel made from? 4150 chrome moly vanadium steel, finished in Black Nitride.

Buy the Faxon Duty Series 10.5-Inch Barrel

Order the Faxon Duty Series 10.5-inch barrel from our Lubbock, Texas gun shop for fast, insured shipping. Browse more Faxon Firearms AR15 barrels for your build.