One Tactical OH-CU04 16″ 300 Blackout Complete Upper Receiver

Upgrade your AR-15 platform with the One Tactical OH-CU04 16″ Complete Upper Receiver chambered in 300 Blackout. This ready-to-install upper receiver assembly is built for shooters who want reliable performance in one of today’s most versatile AR calibers. The 300 Blackout cartridge delivers excellent terminal performance at close to medium ranges, making it a top choice for hunters, home defenders, and tactical shooters alike — and it cycles effectively with both supersonic and subsonic loads.

The OH-CU04 comes fully assembled and ready to drop onto your existing AR-15 lower receiver, offering a cost-effective way to add a 300 Blackout configuration to your collection without purchasing a complete rifle. Whether you’re building out a dedicated suppressor host, a hunting rig, or a versatile range carbine, this complete upper provides a solid foundation.

At Deep Roots Rifle Co, we carry a strong selection of AR upper receivers and components to support your next build or upgrade. Our knowledgeable staff in Eustis, Florida is ready to help you find the right parts for your setup. Order online with fast shipping to your door or FFL, or stop by our local gun store in Eustis, FL to see our in-store inventory and get expert guidance from our team.