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The One Horse OH-BR04 is a 16-inch .300 Blackout barrel cut on a SOCOM profile, giving you that heftier contour under the handguard for better heat management during longer strings. It's machined from 4150 chrome-moly-vanadium steel and finished in black nitride, so it shrugs off corrosion and wears well while staying easy to wipe down. The muzzle comes threaded 5/8×24, which is the standard pitch for .300 BLK, so mounting a flash hider, brake, or suppressor is straightforward.
Here's the part that matters most on a .300 Blackout build. Even at 16 inches, a pistol-length gas system is the go-to for this cartridge because it delivers the dwell time needed to cycle the huge spread of loads .300 BLK is known for. The cartridge runs everything from light supersonic bullets to heavy 200-plus grain subsonics, and the shorter gas length keeps that window as wide as possible. Run it suppressed with subs or open with supersonic loads and the OH-BR04 is tuned to keep the bolt moving.
The 1:7 twist is the sweet spot for .300 Blackout. It spins up the featherweight 110 and 125 grain supersonic loads just fine, and more importantly it locks in the heavy 220 grain subsonics that a lot of folks build a Blackout for in the first place. That versatility is the whole appeal of the caliber, and this barrel is set up to take advantage of it.
One Horse builds these in the USA, and this one is a bare barrel, so it drops into your own upper, gas block, and handguard setup. If you already have parts on the shelf or a specific handguard in mind, starting from the barrel up gives you full control over the finished rig. It's a clean, no-nonsense foundation for a dedicated .300 BLK rifle.
Even at 16 inches, .300 Blackout cycles most consistently with a pistol-length gas system because it provides the right dwell time for the cartridge. The .300 BLK runs a wide range of loads, from light supersonics to heavy subsonics, and the shorter gas length keeps that window as broad as possible. It's the most common and proven setup for the caliber, especially if you plan to shoot suppressed with subsonic ammo.
Yes, that flexibility is exactly what this barrel is built for. The pistol gas system and 1:7 twist together handle everything from lightweight supersonic loads to heavy 220 grain subsonics. Many builders find subsonics cycle most reliably when running a suppressor, which is a typical way .300 BLK barrels are ported.
This is a standalone barrel, not a complete upper. You'll supply your own upper receiver, bolt carrier group, gas block and tube, handguard, and muzzle device to finish the build. Going barrel-up gives you full control over the parts and handguard length you want on your .300 Blackout rig.
The muzzle is threaded 5/8×24, which is the standard thread pitch for .300 Blackout. That makes it easy to add a flash hider, muzzle brake, or a suppressor. The wide compatibility is one of the perks of building on a proper .300 BLK barrel.
| UPC | 850078799135 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | OHBR04 |
| Barrel Length | 16'' |
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