The Radian Weapons Model 1 Upper (brand part no. R0904) is a complete 18-inch upper chambered in 6mm ARC, finished in brown. Every Model 1 is hand-assembled by a trained gunsmith who inspects, test-fires, and cleans it before it ships, and Radian backs it with a lifetime guarantee.

Key Specifications

• Chambered in 6mm ARC.
• 18-inch barrel length.
• Ships as a complete upper.
• Features fully ambidextrous controls.
• Each unit is hand-assembled by a trained gunsmith who inspects, test-fires, and cleans it before shipping.
• Backed by Radian’s lifetime guarantee.
• Part of Radian’s Model 1 upper line.
• Finished in brown.
• At 18 inches, this barrel exceeds the federal minimum rifle-barrel length with room to spare.

Frequently Asked Questions

Does this include a lower receiver? No, this is sold as a complete upper only; a compatible lower is required to complete a firearm.

Is this legal length for a rifle build? Yes, at 18 inches this barrel exceeds the federal minimum rifle-barrel length, so no NFA registration is required to build it into a rifle-configured firearm.

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

Buy the Radian Weapons Model 1 Upper, 18in, Brown

Build a precision 6mm ARC rifle upper with Radian’s hand-assembled, lifetime-guaranteed Model 1. Browse more of our AR15 uppers selection. Order the Radian Weapons Model 1 Upper, 18in, Brown from a Lubbock, TX gun shop; we’ll get it moving to you as soon as it is ready to ship.