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The Faxon Duty Series 16" Gunner barrel is one of those parts that just makes a .300 Blackout build feel right. It's machined from 4150 CMV steel and treated with salt bath nitride inside and out, so you get real corrosion resistance and a long service life without babying it. The 1:8 twist is the sweet spot for .300 BLK, stabilizing everything from featherweight supersonic loads to heavy subsonics, which matters a lot on a cartridge that lives and dies by bullet weight range.
The Gunner contour is a hybrid of the two most proven barrel shapes around: the Government profile and the Pencil profile. From the extension back to the gas block journal it mimics that beefy government taper to hold heat and cut down on whip, then it thins out to a pencil profile up front. The payoff is a barrel that shaves weight off the muzzle end and pulls the balance back toward your body, so the rifle points quick and doesn't wear you out during a long day of shooting, training, or hunting.
This barrel runs a carbine-length gas system with a .750" gas block journal, an M4 barrel extension for standard AR-15 upper fitment, and 5/8×24 muzzle threads ready for your can or muzzle device. It's a genuine do-it-all setup, tuned to cycle reliably whether you're sending supersonics unsuppressed or stacking subsonics through a suppressor.
Faxon makes these barrels 100% in-house in Greater Cincinnati, Ohio, and it shows in the fit and finish. Every barrel is stress relieved, air-gauge tested, magnetic particle inspected, individually headspace checked, and capped with an 11-degree target crown for accuracy. Guys who've built on this barrel report tight groups with common loads like 110gr and 150gr projectiles, and the nitride treatment is tough enough that dimpling for a gas block barely leaves a mark. For the money, it's a hard barrel to beat when you want dependable performance out of your Blackout upper.
Yes, that's exactly what it's built for. The 1:8 twist and carbine-length gas system are tuned to cycle reliably across supersonic and subsonic loads, both suppressed and unsuppressed. It's about as versatile as a .300 BLK barrel gets.
It uses a standard M4 barrel extension, so it drops into any mil-spec AR-15 upper receiver. You'll need a carbine-length gas tube, a .750" gas block, a handguard that clears the profile, and a bolt carrier group set up for .300 Blackout. The 5/8×24 muzzle threads accept most .30 caliber suppressors and muzzle devices.
The Gunner blends a government contour at the chamber end with a pencil profile out front. That keeps material where it helps with heat and whip while trimming weight off the muzzle. The result is a lighter, better-balanced barrel that handles fast and reduces fatigue during long sessions.
It holds its own nicely. Each barrel is button rifled, stress relieved, air-gauge tested, and finished with an 11-degree target crown for consistency. Builders regularly report sub-MOA groups with quality supersonic loads, which is plenty for hunting and range work alike.
| UPC | 816341023222 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 15A38C16NGQ |
| Barrel Length | 16" |
| Caliber/Gauge | .300 AAC Blackout |
| Color | Black |
| Length | 16'' |
| Model | |
| Product Type | Barrel |
| Sights | No |
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