The Faxon Firearms Duty Series barrel is a 12.50-inch, 5.56 NATO AR-15 barrel built for shooters who want a compact, hard-use barrel without cutting corners on materials (brand part no. 15A57C125NMPCL). 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 shorter 12.50-inch length keeps the barrel light and maneuverable, making it a strong option for a compact AR-15 build. It pairs well with a pistol-length or short-carbine gas system for reliable cycling in a compact footprint.

Key Specifications

• Chambered in 5.56 NATO for standard AR-15/M16 magazine and bolt compatibility.
• 12.50-inch barrel length suits a short-barreled rifle or pistol-length AR build.
• 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 12.50-Inch 5.56 Barrel

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