One Horse AR-15 Complete Upper – 10.5″ 5.56 NATO

Build out your AR-15 with confidence using the One Horse AR-15 Complete Upper in 10.5″ 5.56 NATO — a reliable, ready-to-install upper assembly designed for shooters who want performance without the guesswork. This complete upper receiver is ideal for SBR builds, home defense configurations, and range use, offering a compact and maneuverable platform chambered in the proven 5.56 NATO cartridge.

Designed for straightforward compatibility with standard AR-15 lower receivers, this complete upper drops right onto your existing lower for a fast and functional build. Whether you’re building your first AR or adding a dedicated short-barrel configuration to your collection, this upper delivers solid value at a competitive price point.

At Deep Roots Rifle Co, we stock hard-to-find AR components and complete uppers so you can get your build done right. Order online for fast shipping or stop by our gun store in Eustis, Florida, where our knowledgeable staff can help you complete your build with the right parts and accessories.