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The One Horse OH-BR06 is a 10.5-inch .300 Blackout barrel made for folks putting together a short, hard-hitting AR15 pistol or short-barreled rifle. It hits the sweet spot for .300 BLK, giving you enough dwell to run supersonic loads at good velocity while still cooperating with heavy subsonic ammo when you want to keep things quiet. Machined from 4150 steel with a nitride finish, it's the kind of barrel that shrugs off wear and cleans up easy after a long range day.
The 1:7 twist rate is where this barrel really earns its keep. That faster twist does a better job stabilizing the long, heavy subsonic projectiles that .300 Blackout is famous for, which matters a lot if you plan on shooting suppressed. It handles the full spread of bullet weights, so whether you're loading up 110-grain zippers or 220-grain subs, the OH-BR06 keeps them spinning true. The pistol-length gas system is the right call for a barrel this short, giving you reliable cycling and a softer shooting feel.
The muzzle comes threaded 5/8×24, which is the standard for .30-caliber devices, so any flash hider, muzzle brake, or suppressor mount built for .300 BLK will thread right on. That makes this a natural pick for a suppressed setup. If you're mixing subsonic and supersonic loads or running a can, a lot of builders pair a barrel like this with an adjustable gas block to fine-tune cycling across the board.
This is a build component, so plan on supplying your own gas block, gas tube, barrel nut, and the rest of your upper parts. Made in the U.S.A. and cut to Mil-Spec dimensions, it drops into any standard AR15 upper receiver without drama. For anyone chasing a compact, versatile .300 Blackout that can do close-range work, hunting, or quiet range time, this barrel is a solid foundation to build on.
The faster 1:7 twist does a better job stabilizing the long, heavy subsonic bullets that .300 Blackout is known for. It still handles lighter supersonic loads just fine, so you get a barrel that works across the full range of bullet weights. That versatility is a big reason people building suppressed setups lean toward a 1:7.
It's a strong fit. The pistol-length gas system and 5/8×24 muzzle threading pair up well with .300 BLK suppressors and mounts. If you're switching between subsonic and supersonic ammo, adding an adjustable gas block can help you dial in cycling for both quiet and full-power loads.
This is a standalone barrel, so you'll need a stripped or complete upper receiver, a gas block and gas tube, a barrel nut, a handguard, and a bolt carrier group chambered for .300 Blackout. It's cut to Mil-Spec dimensions and drops into any standard AR15 upper. Plan your gas block choice around whether you want fixed or adjustable.
Yes. The barrel follows Mil-Spec AR15 dimensions, so standard uppers, barrel nuts, and gas systems fit as expected. The 5/8×24 muzzle threads accept any .30-caliber flash hider, brake, or suppressor mount made for .300 Blackout.
| UPC | 850078799159 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | OH-BR06 |
| Barrel Length | 10.5'' |
| Shipping Weight | 1.3 |
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