The Faxon Firearms Duty Series Socom Profile Barrel (brand part number 15A58M16NSQ) is a 16-inch, 5.56x45mm NATO AR-15/M16 barrel machined from 4150 Mil-Spec steel and finished inside and out with a QPQ Black Nitride treatment for corrosion resistance. Faxon cuts the barrel to a Socom profile with a mid-length gas system, button-rifles the bore at a 1:8 twist, and finishes the muzzle with an 11-degree target crown for a clean, consistent shot exit. Every barrel is individually gauged for headspace on precision hardened gauges before it leaves the factory, and it’s threaded 1/2-28 with a 1.1-inch gas block journal and standard M4 barrel extension for drop-in compatibility with mil-spec AR-15/M16 uppers.

Key Specifications

• Chambered in 5.56x45mm NATO, compatible with .223 Remington.
• Cut with a 1:8 twist rate.
• Measures 16 inches in length.
• Machined from 4150 Mil-Spec steel.
• Finished inside and out with QPQ Black Nitride.
• Cut to a Socom profile with a mid-length gas system.
• Uses button rifling for consistent accuracy.
• Finished with an 11-degree target crown.
• Threaded 1/2-28 with a 1.1-inch gas block journal.
• Built with a standard M4 barrel extension for mil-spec upper compatibility.

Frequently Asked Questions

What gas system length does this barrel use? A mid-length gas system, part of the Socom profile design.

Is every barrel checked for headspace? Yes, Faxon individually gauges each barrel for headspace on precision hardened gauges before it ships.

Will it fit my mil-spec AR-15 upper? Yes, it uses a standard M4 barrel extension and 1.1-inch gas block journal for mil-spec compatibility.

Buy the Faxon Firearms Duty Series Socom Profile Target Crown Barrel

Build a duty-grade AR-15 upper around a barrel that’s individually gauged and finished to hold its zero. Order it from our Faxon Firearms lineup, part of our AR15 barrels selection, at our Lubbock, Texas gun shop for fast, direct shipping.