The Faxon Firearms Duty Series barrel is a 16-inch, 5.56 NATO AR-15 barrel built for shooters who want a versatile, hard-use rifle-length barrel without cutting corners on materials (brand part no. 15A57C16N4PCL). FAXON FIREARMS machines it from 4150 Chrome-Moly-Vanadium steel and finishes it in black chrome with a mag phosphate coating for corrosion resistance, then cuts a 1-in-7 twist to stabilize heavier 5.56 bullet weights. The 16-inch length is the classic all-around AR-15 barrel length, balancing velocity, maneuverability, and legal minimum barrel length with room to spare. It pairs well with a carbine- or mid-length gas system for reliable cycling.

Key Specifications

• Chambered in 5.56 NATO for standard AR-15/M16 magazine and bolt compatibility.
• 16-inch barrel length, the classic all-around AR-15 barrel length.
• 1-in-7 twist rate stabilizes heavier 5.56 bullet weights.
• Machined from 4150 Chrome-Moly-Vanadium (CMV) steel for strength and heat resistance.
• Black chrome, mag phosphate finish resists corrosion and wear.

Frequently Asked Questions

What twist rate does this barrel use? A 1-in-7 twist, suited to heavier 5.56 bullet weights.

What steel is this barrel made from? 4150 Chrome-Moly-Vanadium (CMV) steel, finished with black chrome and mag phosphate coating.

Buy the Faxon Firearms Duty Series 16-Inch 5.56 Barrel

Order this Duty Series barrel from our Lubbock, Texas gun shop for a versatile, all-around AR-15 build. Browse our full AR15 barrels lineup for more lengths and calibers. Ships fast from a Lubbock, TX gun shop.