Radian Model 1 Upper 18″ 6mm ARC – FDE Ambidextrous Upper Receiver Assembly

Built to the most exacting standards in the industry, the Radian Model 1 18″ 6mm ARC Upper in Flat Dark Earth represents the pinnacle of American-made AR platform engineering. Radian Weapons’ design philosophy is straightforward: source only the highest-quality raw materials, leverage the most precise CNC machining available, and pair it all with the best components on the market — the result is an upper receiver assembly that seamlessly blends elite-level performance with refined aesthetics.

The Model 1 upper features fully ambidextrous controls, making it equally capable in the hands of left- or right-handed shooters without compromise. Every Radian upper is hand-assembled, one at a time, by a trained gunsmith who personally inspects, test fires, and cleans each unit before it leaves the facility — a commitment to craftsmanship that few manufacturers can match.

Chambered in 6mm ARC (Advanced Rifle Cartridge), this 18″ configuration delivers exceptional long-range ballistic performance, flat trajectory, and impressive energy retention — making it an outstanding choice for precision hunters, competitive long-range shooters, and serious enthusiasts demanding more from their AR platform. The FDE finish adds a tactical, field-ready aesthetic that pairs beautifully with a wide range of lower receiver options.

Backed by Radian’s lifetime guarantee, this upper is built to last and designed to perform at the highest level, shot after shot.

At Deep Roots Rifle Co, we stock hard-to-find, premium components like the Radian Model 1 Upper so you don’t have to settle. Order online for fast shipping to your FFL dealer, or visit our gun store in Eustis, Florida, where our knowledgeable staff can help you complete your build or answer any questions you have.