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The 300 Blackout cartridge was designed from the ground up for short barrels, and that is exactly why the One Horse OH-15 makes so much sense. With a 7.5 inch medium-profile barrel, this AR pistol burns nearly all of its powder before the bullet leaves the muzzle, so you are not giving up much velocity compared to a longer gun. What you gain is a compact, quick-handling platform that shines in tight spaces, whether that is a hallway, a blind, or the cab of a truck.
One Horse builds this pistol in the USA with the parts you would want on a short 300 BLK gun. The barrel wears a 1:8 twist that handles everything from 110 grain supersonics to heavy 190 to 220 grain subsonics, and the muzzle is threaded 1/2×28 with an A2 flash hider installed. Spin that off and you have a natural host for a suppressor, which is where subsonic 300 Blackout really earns its reputation. A carbine-length gas system, mil-spec buffer tube, and standard charging handle keep the operation familiar to anyone who has spent time behind an AR. The 7 inch handguard gives you room for a light or forward accessory without adding bulk.
The included KAK brace stabilizes the gun nicely for one-handed or supported shooting, and the A2 grip and thumb safety will feel like home if you grew up on mil-spec furniture. Recoil from the 300 BLK in this platform is soft and controllable, so follow-up shots come fast. One 30-round magazine ships in the box, so you can load up and get to work the day it arrives.
Short answer: ballistics. A 5.56 loses a lot of steam out of a 7.5 inch tube, while 300 Blackout was purpose-built for this barrel length. You get significantly more energy on target, better suppressed performance, and full compatibility with standard AR magazines and controls. For a compact defensive setup or a fun range gun with real punch, the OH-15 checks the boxes without a boutique price tag.
Yes. The 7.5 inch barrel is threaded 1/2×28 and comes with an A2 flash hider installed. Remove the A2 and you can mount a direct-thread suppressor or a muzzle device for your quick-detach can. Paired with subsonic 300 BLK ammo, this is one of the quietest suppressed setups you can run on an AR platform.
It will. The 1:8 twist rate handles the full spectrum of 300 Blackout bullet weights, from light 110 grain supersonic loads up to heavy 190 to 220 grain subsonics. That flexibility lets you run cheap supers for range days and switch to subs when shooting suppressed without worrying about stability.
Yes, 300 Blackout uses the same magazines and bolt as 5.56, and the OH-15 ships with one 30-round mag. That said, we recommend dedicated 300 BLK marked magazines if you own both calibers. Keeping mags clearly separated prevents accidentally chambering a 300 BLK round in a 5.56 gun, which is a mistake you only make once.
The 300 Blackout cartridge was specifically designed to reach full performance out of short barrels, so a 7.5 inch tube gives up very little velocity. A 5.56 round loses a large chunk of its energy at that length and produces a lot more muzzle blast. For a compact AR pistol, 300 BLK simply makes better use of the platform.
| UPC | 850078799982 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | OH-OP06 |
| Action | |
| Barrel Length | 7.5'' |
| Capacity | 30 |
| Magazine Included | 1 x 30-Round |
| Model | |
| Safety | Thumb |
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