Faxon 7.5" .300 Blackout Gunner Barrel

The Faxon 7.5" .300 Blackout Gunner barrel pushes the compact envelope for .300BLK builds, delivering the shortest practical barrel length for shooters who prioritize maximum concealability and minimum overall weapon length. At 7.5 inches, this barrel sacrifices approximately 100-150 fps compared to the optimal 9" length, but the trade-off buys you a meaningfully more compact package for vehicle guns, PDW builds, and dedicated close-quarters platforms.

The physics of .300 Blackout at 7.5 inches are straightforward: you'll see slightly more unburned powder exiting the muzzle, which translates to increased flash signature (particularly with supersonic loads) and marginally more back-pressure for suppressors to manage. That said, .300 Blackout was specifically designed for short barrels, and 7.5 inches still delivers substantially better terminal performance than 5.56 NATO from a barrel of any length. With subsonic ammunition, the velocity difference is negligible and the suppressed signature remains excellent.

Faxon's Gunner profile keeps listed barrel weight to 0.87 pounds by using a hybrid taper between pencil and government profiles. The 4150 CMV steel with salt-bath nitride inside and out provides durability and corrosion resistance, and the 1:8 twist is Faxon's general-purpose twist for common .300 BLK supersonic loads and many subsonic setups. For compact defensive, training, or range builds where every fraction of an inch matters, this barrel delivers a very short .300 Blackout platform without resorting to exotic barrel lengths that create reliability issues.