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The .300 Blackout cartridge was designed from the ground up to perform in short barrels, and that is exactly why the One Horse OH-15 makes so much sense. Its 10.5 inch medium-profile barrel gives the round enough length to burn its powder efficiently, so you get real terminal performance without the huge fireball and concussion you deal with when running 5.56 out of a barrel this short. Pair that with a carbine-length gas system and you have a pistol that cycles smoothly and stays comfortable through long range sessions.
Up front, the 9.25 inch M-LOK handguard leaves plenty of real estate for a light, hand stop, or sling mount while keeping the whole package slim and easy to grip. The barrel is threaded 5/8×24 and wears a standard A2 muzzle device, so swapping to a suppressor or aftermarket brake takes just a few minutes. The 1:8 twist rate is a smart choice for .300 BLK since it stabilizes both fast supersonic loads and heavy subsonics, which matters a lot if you plan on shooting suppressed down the road. Out back, the KAK brace rides on a mil-spec buffer tube, and the A2 grip and standard charging handle keep everything familiar for anyone who has spent time behind an AR.
One Horse builds the OH-15 here in the United States and ships it as a complete pistol with a 30-round magazine included, so there is nothing to assemble and nothing extra to buy before your first trip to the range. At just over 7 pounds it balances well and points quickly, which makes it a natural fit for home defense setups, truck duty, or just a fun compact range gun. Because everything on it is standard AR-pattern, upgrading triggers, grips, or optics mounts later is simple. It is a straightforward, well-thought-out .300 BLK platform that gets the fundamentals right.
Yes, the barrel is threaded 5/8×24, which is the standard thread pitch for .30 caliber cans and muzzle devices. Just remove the A2 device and thread on your suppressor or mount. The 1:8 twist also stabilizes heavy subsonic loads well, so this pistol pairs nicely with suppressed shooting.
Supersonic loads cycle reliably in this setup out of the box. As with most unsuppressed .300 BLK guns, some subsonic loads may need a suppressor's added back pressure or an adjustable buffer setup to run consistently. If you shoot mostly supersonic, you are good to go as-is.
Yes, it ships as a complete pistol with one 30-round magazine included. Since it uses standard AR-15 pattern magazines, spares are cheap and easy to find. Just make sure any mags you buy are rated for .300 Blackout or use standard 5.56 mags, which generally feed .300 BLK fine.
The .300 Blackout was specifically designed to reach full performance from short barrels, so a 10.5 inch tube loses very little compared to a rifle. You get less muzzle blast and flash than 5.56 at this length, plus a bigger, heavier bullet. It is one of the best cartridge choices for a compact AR pistol, especially if suppressed shooting is in your plans.
| UPC | 850078799807 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | OH-OP02 |
| Action | |
| Barrel Length | 10.5'' |
| Capacity | 30 |
| Color | Black |
| Magazine Included | 1 x 30-Round |
| Model | |
| Number of Magazines | 1 |
| Safety | Thumb |
| Shipping Weight | 7.2 |
| Sights Type | NONE |
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