The Faxon Gunner .338 ARC barrel is a 16-inch, pistol-length-gas AR-15 barrel from the Faxon Match Series (Faxon part no. 15B338A8P16NGQ-5R-NP3). Faxon makes it in-house in Cincinnati from 416R stainless steel with a 1:8 twist and a black nitride finish. The Gunner profile blends the rigidity of a Gov’t contour with the weight savings of a pencil profile. Each barrel is magnetic particle inspected and individually headspaced with PTG gauges.

Key Specifications

• The chambering is .338 ARC.
• The length is 16 inches with a 1:8 right-hand twist.
• The material is 416R stainless steel with button rifling.
• The finish is black nitride for corrosion and wear resistance.
• The profile is Gunner, a mix of Gov’t strength and pencil weight savings.
• The muzzle is threaded 5/8×24, compatible with .30-caliber suppressors and standard muzzle devices.
• The gas system is pistol-length, with a .750-inch gas block diameter.
• The gas block journal is 1.9 inches long.
• The barrel extension is M4 and the crown is an 11 degree target crown.
• It weighs 1.40 pounds.

Frequently Asked Questions

Is this barrel compatible with a standard AR-15 upper? Yes, provided the upper is set up for the .338 ARC cartridge with the correct bolt and magazines. Faxon recommends Duramag magazines designed for 400 Legend.

Can I run a suppressor? The 5/8×24 muzzle threads are compatible with most suppressors, according to Faxon.

Are there feeding notes for the .338 ARC? Faxon notes that some customers may need to adjust upper receiver feed ramps for reliable feeding, particularly with Hornady Sub-X ammunition.

Buy the Faxon Gunner Barrel, .338 ARC, 16-Inch, Black Nitride, 5/8×24 Threaded

A match-grade stainless barrel is the heart of a .338 ARC build, and this Gunner profile keeps weight and rigidity in balance. Order it from our Lubbock, Texas gun shop for fast, direct shipping. See more from Faxon Firearms and browse our AR-15 barrels.