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The One Horse OH-15 is a complete, factory-assembled AR chambered in .300 Blackout, so you skip the parts-sourcing rabbit hole and get straight to the range. It runs a 16" 4150 steel barrel with a 1:7 twist, a 15" free-float M-LOK handguard, and ships with a 30-round magazine. The whole rifle comes in right around 7.14 pounds, which keeps it easy to carry and quick to shoulder, and it's built in the USA with U.S.-sourced materials.
What makes .300 BLK such a popular choice is its range of jobs from a single platform. Lightweight supersonic loads in the 110 to 150 grain range give you flat-shooting, traditional rifle performance for the range or hunting, while heavy 200 to 220 grain subsonics run whisper-quiet behind a can. The 1:7 twist leans toward stabilizing those heavier subsonic bullets, which is exactly what you want if a suppressor is on your radar. Swap mags and you swap missions.
The 15" handguard is fully free-floated, meaning the barrel never touches the rail. That helps consistency and gives you a long stretch of M-LOK real estate for lights, a hand stop, a bipod, or whatever your setup calls for. A full-length Picatinny top rail leaves plenty of room for optics, irons, or a mix of both. The 4150 steel barrel handles heat well during longer strings, and the 5/8×24 threaded muzzle is the standard pitch for .30-caliber suppressors and aftermarket muzzle devices.
This one makes sense for the shooter who wants a do-it-all .300 Blackout without piecing together a build or overpaying. It's a sensible home-defense option, a fun suppressor host, and an easy rifle to hand off to a newer shooter thanks to the mild recoil of the cartridge. If you already shoot 5.56 and want something with a different ballistic personality in the same familiar AR package, the OH-15 covers that ground nicely.
One quick note worth knowing: .300 BLK rounds will physically fit in standard AR magazines, so it's smart to mark your .300 mags clearly to keep them separate from 5.56. It's an easy habit that keeps things safe.
Yes, and that flexibility is the whole appeal of the cartridge. You can run lightweight supersonic loads for flatter trajectories and more energy at distance, then switch to heavy subsonic ammo for quiet, low-recoil shooting behind a suppressor. The 1:7 twist leans toward stabilizing the heavier subsonic bullets, so a suppressed setup is right in this rifle's wheelhouse.
The muzzle is threaded 5/8×24, which is the standard pitch for .30-caliber suppressors and most aftermarket muzzle devices. That means a compatible can or brake threads right on without extra adapters. Pairing it with subsonic .300 BLK loads is one of the quietest combinations you can run on an AR platform.
Yes, this configuration ships with one 30-round magazine, so you've got what you need to load up and head to the range. Many builders pick up a few extras since mags are consumable gear, but the rifle is ready to run as it arrives.
It follows standard AR-15 specs, so common optics, mounts, and grips will work as expected. The 15-inch handguard uses M-LOK slots for lights, grips, bipods, and hand stops, and the full-length Picatinny top rail handles your optic and backup irons. If you've built or accessorized an AR before, everything will feel familiar.
Standard AR magazines will feed .300 BLK, though some heavier subsonic loads feed more reliably from mags with a .300-specific follower. The bigger thing to know is that .300 BLK rounds fit in 5.56 mags, which makes it important to clearly mark and separate your .300 magazines. A paint mark, colored floor plate, or band is a simple way to keep them sorted.
It's a versatile do-it-all .300 Blackout that handles range time, home defense, and suppressed shooting from one rifle. The mild recoil and 16-inch barrel make it comfortable to shoot and easy to maneuver. It's a good fit for anyone who wants a complete, ready-to-run rifle rather than sourcing every part for a build.
| UPC | 850078799678 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | OH-OG04 |
| Action | |
| Barrel Finish | Black |
| Barrel Length | 16'' |
| Caliber/Gauge | .300 AAC Blackout |
| Capacity | 30 |
| Color | Black |
| Magazine Included | 1 x 30-Round |
| Model | |
| Shipping Weight | 7.85 |
| Thread Pattern | 5/8"x24 |
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