The Faxon Firearms Pencil Duty Series Barrel (brand part no. 15A58C10NPQ) is a 10.5-inch, 5.56 NATO AR15 barrel machined from certified 4150 mil-spec chrome moly vanadium steel and finished in black nitride, built to Faxon’s in-house manufacturing standards. Faxon Firearms stress relieves and air-gauge tests every barrel, then cuts an 11-degree target crown for accuracy before a final headspace check with precision custom hardened gauges. It is a durable, no-compromise option for a compact 5.56 build that still needs to hold up to hard, repeated use.

Key Specifications

• Chambered in .223 Rem / 5.56 NATO.
• 10.5-inch barrel length.
• 1:8-inch twist rate.
• Machined from certified 4150 mil-spec chrome moly vanadium steel.
• Finished in black nitride.
• Fully stress relieved and air-gauge tested.
• 11-degree target crown for accuracy.
• Individually checked for headspace with precision custom hardened gauges.
• Manufactured in-house in Cincinnati, Ohio.
• Built for the AR15 platform.

Frequently Asked Questions

What caliber is this barrel chambered in? .223 Rem / 5.56 NATO.

What twist rate does it use? 1:8-inch.

Is every barrel headspace checked? Yes, each one is individually checked with precision custom hardened gauges.

Buy the Faxon Firearms Pencil Duty Series Barrel

Build a compact, durable 5.56 upper with a barrel tested at every stage of manufacturing. Order it from our AR15 barrels selection at our Lubbock, Texas gun shop for fast, direct shipping.