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The One Horse OH-CU04 takes the guesswork out of putting together a dedicated .300 Blackout AR-15. It arrives fully assembled with a 16-inch 4150 steel SOCOM-profile barrel, a nitride bolt carrier group, a charging handle, and a 15-inch M-LOK free-float handguard. Pin it onto any mil-spec lower and you've got a working rifle, no barrel nut wrenches or headspacing headaches required.
The 4150 steel barrel wears a 1:7 twist, which is the sweet spot for .300 BLK since the cartridge runs everything from light supersonic bullets to heavy subsonic loads. It's paired with a pistol-length gas system, and that pairing is the whole reason this configuration is so popular. The shorter gas port sits closer to the chamber, which helps the bolt get enough push from quiet subsonic ammo while still handling faster supersonic rounds. In plain terms, it's the setup that tends to run reliably right out of the box with the widest range of .300 Blackout loads.
The muzzle is threaded 5/8×24 and ships with an A2 flash hider installed, so swapping to a suppressor or a different muzzle device is a simple job. That threading, plus the pistol gas system, makes this a natural fit for a can and heavy subsonic ammo when you want things quiet, and it flips right back to supersonic duty for hunting or general range work. The 15-inch M-LOK rail free-floats the barrel for better accuracy potential and gives you a long, uninterrupted stretch of real estate for a light, bipod, hand stop, or grip.
Since it's a complete upper, the heavy lifting is already done. The nitride BCG and charging handle are in the box, the full-length Picatinny top rail is ready for your optic or backup sights, and the whole thing is made in the USA. Bolt it to a lower, run a function check, lube it up, and you're set to head to the range.
Yes. This is a true complete upper, so the nitride BCG and charging handle are both included in the box. All you need to add is a compatible mil-spec lower receiver to have a functioning rifle.
It's built to pin onto any standard mil-spec AR-15 lower receiver. If your lower is spec'd for a 5.56 or .223 upper, this .300 Blackout upper will mount right up since the lower and magazines are shared across the platform.
That's exactly what the pistol-length gas system is designed for. The shorter gas port helps cycle quiet subsonic loads while still handling faster supersonic rounds, which is why this configuration is a favorite for versatile .300 BLK builds. As always, do a function check and try a few different loads to confirm reliable cycling with your setup.
Yes, the muzzle is threaded 5/8×24, which is the standard thread pitch for .300 Blackout. It ships with an A2 flash hider installed, and you can swap that out for a suppressor or another compatible muzzle device without any trouble.
| UPC | 850078799319 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | OH-CU04 |
| Color | Black |
| Length | 16'' |
| Style | Complete |
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