Description
The One Horse OH-CU04 Complete Upper Receiver (MPN: OH-CU04) is a 16-inch .300 Blackout AR-15 upper supplied with the major components needed for a complete top-end assembly, including a nitride bolt carrier group and charging handle. Its longer barrel and 15-inch free-float M-LOK handguard make it a different configuration from One Horse’s shorter .300 BLK uppers, with more rail space and a rifle-length overall profile.
One Horse specifies a 16-inch 4150 steel SOCOM-profile barrel with a 1:7 twist, pistol-length gas system, 5/8x24 muzzle threads, and an A2-style muzzle device. The 15-inch M-LOK free-float handguard uses a clamp-on mounting system with a steel barrel nut and screws. A full-length top rail supports compatible optics and sights, while the included nitride BCG and charging handle make the upper ready to install on an appropriate Mil-Spec AR-15 lower receiver. One Horse lists the assembly as made in the USA.
Key Features & Compatibility
- 16-Inch .300 Blackout Barrel: SOCOM-profile 4150 barrel with 1:7 twist.
- Pistol-Length Gas System: Factory gas configuration specified for the OH-CU04.
- 15-Inch Free-Float M-LOK: Long accessory-ready handguard with a full-length top rail.
- Nitride BCG & Charging Handle: Both major operating components are included.
- 5/8x24 Threaded Muzzle: Uses the common .30-caliber AR thread pattern and includes an A2-style muzzle device.
The OH-CU04 is suited to buyers who want a complete 16-inch .300 Blackout upper with a long free-float handguard rather than assembling the upper from individual components. Browse ammunition at Recoil Gunworks.
Specs
