One Horse AR-15 Complete Upper – 16″ 5.56 NATO

Build or upgrade your AR-15 with confidence using the One Horse AR-15 Complete Upper in 16″ 5.56 NATO. Designed for reliability and performance, this complete upper assembly gives you everything you need to get your rifle running — no gunsmithing required. Whether you’re finishing a stripped lower build, replacing a worn upper, or simply upgrading your platform, this complete upper offers a straightforward, dependable solution for shooters of all experience levels.

Chambered in the versatile and widely available 5.56 NATO, this upper is compatible with standard .223 Rem ammunition as well, making it an excellent choice for home defense, range training, competition, and recreational shooting. The 16″ barrel length strikes the ideal balance between maneuverability and ballistic performance, keeping your rifle legal for non-NFA configurations while delivering solid downrange results.

At Deep Roots Rifle Co, we stock hard-to-find components and complete uppers so you don’t have to wait. Order online for fast shipping nationwide, or stop by our gun store in Eustis, Florida, where our knowledgeable staff can answer your questions and help you complete your build. Competitive pricing, expert guidance, and a passion for the AR platform — that’s the Deep Roots difference.