The Radian Weapons Model 1 Complete Upper (Radian Weapons part no. R0905) is an 18-inch 6mm ARC upper finished in gray. Built by Radian Weapons, every Model 1 upper is assembled by hand, one at a time, by a trained gunsmith who inspects, test fires, and cleans the weapon to personally guarantee it meets the brand’s quality standards. The Model 1’s design philosophy pairs the highest-quality raw materials and precise CNC machining with fully ambidextrous controls, giving left- and right-handed shooters the same level of utility. Every Radian product, including this upper, is backed by a lifetime guarantee.

Key Specifications

• Chambered in 6mm ARC.
• Built with an 18-inch barrel.
• Finished in gray.
• Features fully ambidextrous controls for left- and right-handed shooters.
• Hand-assembled and function-tested by a trained gunsmith before it ships.
• Backed by Radian’s lifetime guarantee.
• Ships as a complete upper, including the bolt carrier group and charging handle, not a stripped receiver.
• Machined using precision CNC equipment from premium raw materials.
• Individually test-fired by the assembling gunsmith rather than sample-tested.

Frequently Asked Questions

What caliber is this upper chambered in? It is chambered in 6mm ARC.

How long is the barrel? It uses an 18-inch barrel.

Is this upper hand-built and tested? Yes, every Model 1 is assembled, test fired, and cleaned by a trained gunsmith before it ships.

Buy the Radian Weapons Model 1 18-inch 6mm ARC Complete Upper, Gray

Add a precision-built 6mm ARC upper to your AR-15. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and see our full AR-15 upper lineup for more Radian Weapons options.