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Faxon's Gunner Barrel for the .300 AAC Blackout is made from 4150 Chrome moly that's hardened for durability. It is designed with a unique contour that combines rigidity and light weight, resulting in excellent accuracy and maneuverability. This barrel matches Faxon's skinny "Pencil" profile from the muzzle to the gas block to ensure minimal weight and ease of handling. The part from the gas block back to the barrel extension has additional metal to provide rigidity and fight distortion due to heat created in longer shooting sessions.

These barrels come in three variations. The 7.5" and 10.5" barrels have a gas port that's drilled for a pistol-length gas tube. Meanwhile, the 16" barrel has a carbine-length gas port. All barrels are SAAMI-chambered with 1-8" twist rifling that stabilizes 300 BLK bullets. They have a gas port of .104", a gas block journal of .750", and an outside diameter of 1.9". The muzzle is 11° target crowned with 5/8-24 TPI muzzle threads. The black barrel has a QPQ Nitride finish with an NP3-coated barrel extension, and M4 feed ramps.

The Faxon .300 AAC Blackout Gunner Barrel profile shifts the center of gravity rearward, placing weight under the support hand, which makes the rifle more maneuverable.