The Faxon Match Series 6-inch .300 Blackout barrel is the shortest barrel in Faxon’s fast-twist .300 Blackout line (brand part no. 15B35P6NGQ-5R-NP3). A 1:5 twist stabilizes the long subsonic bullets that slower twists struggle with, and the Gunner profile keeps the barrel stiff enough to carry a suppressor at just 0.74 lb. It is machined from 416-R stainless, 5R button rifled and salt-bath nitrided, with a nickel-Teflon M4 extension that is torqued, pinned and headspaced before it ships. The pistol-length gas system keeps the whole package compact, even with a suppressor mounted. This barrel from Faxon Firearms suits a short suppressed AR build.

Key Specifications

• The length is 6 inches, the shortest option in the Match Series .300 Blackout line.
• The cartridge is .300 Blackout, built to work from short barrels.
• The profile is Gunner, which stays stiff enough to carry a suppressor at low weight.
• The gas system is pistol length, and the barrel works with a .750-inch gas block and a pistol gas tube.
• The steel is 416-R stainless, a match-grade barrel material.
• The finish is QPQ nitride, salt-bath nitrided inside and out for wear and corrosion resistance.
• Rifling is 5R button rifled with a 1:5 twist, which stabilizes heavy subsonic bullets of 220 to 240 grains and more.
• Weight is 0.74 lb, a light load for a compact pistol build.
• The nickel-Teflon M4 extension is torqued to 150 ft-lb, pinned and checked with a .300 Blackout go/no-go gauge.
• The muzzle is threaded 5/8×24, for .30 caliber suppressors and 5/8×24 muzzle devices.

Frequently Asked Questions

What twist rate does it use, and why? It uses a 1:5 twist, which stabilizes the longest, heaviest subsonic bullets, including solids of 240 grains and more, from a 6-inch barrel. Supersonic loads run as well.

Will expanding subsonic bullets work from a 6-inch barrel? Faxon notes that subsonic loads give up velocity at every inch cut, and that expanding subsonic hunting bullets need a minimum impact speed to open reliably. A 7.5- or 9-inch Match 1:5 barrel gives more margin for that use.

What does it fit? Faxon lists a .750-inch gas block, a pistol gas tube, a 5.56/.300 Blackout bolt carrier group, 5/8×24 muzzle devices and .30 caliber suppressors as compatible.

Buy the Faxon Match Series Gunner 6-Inch .300 Blackout 1:5 Pistol-Length AR-15 Barrel

This barrel is the choice when the goal is the smallest suppressed .300 Blackout package, a 6-inch barrel at 0.74 lb with the extension already torqued, pinned and headspaced. Order it with our other AR barrels from our Lubbock, Texas shop for fast direct shipping.