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The One Horse 16" 5.56/.223 Complete Upper takes the guesswork out of building an AR-15. It comes fully assembled around a 16-inch 5.56 NATO barrel, so all you need is a stripped or complete mil-spec lower and you have a working rifle. Because the chamber is cut for 5.56 NATO, you can run both 5.56 and .223 Remington through it, which keeps your ammo options wide open for range days, training, or plinking. The barrel wears a SOCOM profile with a mid-length gas system, and that combination gives you a smoother recoil impulse than a carbine-length setup along with the extra rigidity that helps with consistent groups.
The barrel is 4150 chrome moly vanadium steel with a nitride finish, and it spins a 1:8 twist. That twist rate is the sweet spot for a do-it-all AR, stabilizing everything from cheap 55-grain blasting ammo up to heavier 77-grain match loads without complaint. Up top sits a forged 7075-T6 receiver with a full-length Picatinny rail, giving you plenty of room to mount an optic, iron sights, or a mix of both.
The 15-inch M-LOK handguard free-floats the barrel, meaning nothing touches the barrel to throw off your shots, and it opens up real estate for lights, a bipod, a vertical grip, or a hand stop. M-LOK slots run at the 3, 6, 9, and 12 o'clock positions with a forward 1913 rail section. Inside, the nitride bolt carrier group and charging handle are included, so cycling is smooth right out of the gate and cleanup is quick since nitride shrugs off fouling and resists corrosion.
One Horse builds these in the U.S.A. and keeps things simple: a no-frills, work-ready upper that pins on and goes. The handguard uses a clamp-on system with a steel barrel nut and screws, and the muzzle is threaded 1/2×28 with an A2 flash hider already installed, so swapping in a different muzzle device or a suppressor down the road is a breeze.
Yes. It is built to mil-spec dimensions and pins onto any standard AR-15 lower receiver using the front and rear takedown pins. If your lower and BCG are mil-spec, this upper drops right on with no fitting required.
You can. The barrel is chambered in 5.56 NATO, which safely handles both 5.56 NATO and .223 Remington ammunition. That gives you flexibility to run inexpensive range ammo or step up to premium loads without worrying about compatibility.
The 1:8 twist is about as versatile as it gets for 5.56. It stabilizes light 55-grain bullets for casual shooting and heavier 62 to 77-grain projectiles for more precise work, so it covers most of what you would want to feed an AR-15.
It does. The nitride BCG and charging handle are both included, so the upper is truly complete out of the box. All you need to add is your lower receiver to have a functioning rifle.
| UPC | 850078799289 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | OH-CU01 |
| Color | Black |
| Length | 16'' |
| Shipping Weight | 4.95 |
| Style | Complete |
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