The Faxon Firearms Duty Series .300 Blackout 10.5-inch Barrel, Black Chrome Mag Phosphate (brand part no. 15A38P10NGPCL) is part of Faxon’s Duty Series barrel line, built for a compact .300 Blackout upper. It carries a black, chrome-lined bore under a manganese phosphate exterior finish for corrosion resistance, and its 1:8 twist rate stabilizes the full range of .300 Blackout bullet weights. At 10.5 inches, this barrel sits well under the federal 16-inch minimum for a rifle-configured lower, so it must be installed on a registered Short-Barreled Rifle or a pistol-configured upper without a shoulder stock. For builders assembling a compact .300 Blackout SBR or pistol, this AR15 barrel is sized for that configuration.

Key Specifications

• Chambered in .300 AAC Blackout.
• Barrel length measures 10.5 inches.
• Rifling twist is 1:8.
• Finished in black chrome-lined with a manganese phosphate exterior coating.
• Part of Faxon’s Duty Series barrel line.
• Carries no sight cuts of its own.
• At 10.5 inches, it is under the 16-inch federal rifle minimum and requires an SBR or pistol-configured lower.

Frequently Asked Questions

Can I put this barrel on a standard rifle-configured lower? No, at 10.5 inches it is under the federal 16-inch minimum; it must go on a registered SBR or a pistol-configured upper without a shoulder stock.

What twist rate does this barrel use? 1:8, which stabilizes the full range of .300 Blackout bullet weights.

Buy the Faxon Duty Series .300 Blackout 10.5in Barrel, Black Chrome

A compact 10.5-inch .300 Blackout barrel gives SBR and pistol builders a short, chrome-lined foundation from a proven barrel maker. Order it from our Lubbock, Texas gun shop for fast, insured shipping.