Faxon Firearms 15A38P10Ngq 300 Blackout 10.50" Black Nitride 4150 Cmv Barrel

The Faxon Firearms 300 Blackout 10.50" barrel brings together proven design philosophy and meticulous manufacturing to deliver a dependable foundation for subsonic shooters, SBR builders, and suppressed rifle enthusiasts. Built in-house at Faxon's Cincinnati facility from certified 4150 CMV steel, this barrel uses the Gunner profile—a hybrid that balances the durability of a Government profile with the weight and handling benefits of a Pencil profile. The result is a barrel that reduces muzzle-heavy feel, cuts fatigue during extended shooting sessions, and handles equally well on the bench, in training, or in the field.

Every Faxon barrel undergoes rigorous quality control before it leaves the shop. The 300 Blackout undergoes full stress relief, air-gauge testing, and precision headspace verification using PTG gauges. The button-rifled bore is crowned at 11 degrees for consistent accuracy, and the Nitride finish—applied inside and out—provides corrosion resistance and wear protection without the brittleness of some harder coatings. The 1:8 twist rate stabilizes a range of 300 Blackout loads, from light target rounds to heavy subsonic ammunition commonly paired with suppressors.

Threaded 5/8x24 for standard suppressor mounts, the 10.5" length makes this barrel a natural fit for short-barreled rifles, pistol-caliber carbines, and compact builds where velocity and concealability matter equally. Whether you're assembling a 300 BLK AR-15 platform upper or replacing a worn tube, this is American-made steel backed by a maker who understands what shooters actually need.

Key Features

• Gunner profile balances durability with reduced weight and improved handling
• 4150 CMV steel, fully stress relieved for consistent performance
• Nitride finish resists corrosion and wear
• Button rifled with 11-degree target crown for accuracy
• Individual headspace verification with precision PTG gauges
• 1:8 twist rate for 300 Blackout ammunition range
• 5/8x24 threading for suppressor compatibility
• Made in Cincinnati, Ohio

Specifications

Frequently Asked Questions

Will this barrel work with a suppressor?

Yes. The 5/8x24 muzzle threading is the standard suppressor mount for 300 Blackout. It pairs seamlessly with most commercial suppressors designed for this caliber.

What is the Gunner profile and why does it matter?

The Gunner profile blends the strength of a Government profile barrel with the weight savings and reduced rotating mass of a Pencil profile. The result is a barrel that feels more balanced toward the shooter's body, reducing fatigue during long shooting sessions and improving handling without sacrificing rigidity or accuracy.

Is this barrel suitable for subsonic ammunition?

Yes. The 1:8 twist rate is designed to stabilize the range of 300 Blackout loads, including subsonic ammunition commonly used with suppressors.

How is headspace quality assured?

Every barrel is individually checked for headspace using precision PTG gauges before shipment. Additionally, each barrel undergoes stress relief, air-gauge testing, and a full battery of inspections throughout the manufacturing process.