The Radian Weapons R0903 Model 1 is a complete AR-platform upper chambered in 6mm ARC, built around an 18-inch black nitride steel barrel. It’s sold as an upper only, with no lower receiver included.

Key Specifications

• Complete upper, chambered in 6mm ARC
• 18-inch barrel
• Black nitride steel barrel finish
• Sold as an upper only, no lower receiver included
• Part of Radian’s Model 1 upper lineup
• Compatible with mil-spec AR-15 pattern lowers
• Steel barrel construction
• Chambered specifically for the 6mm ARC cartridge

Frequently Asked Questions

Does this upper come with a lower receiver?
No, it’s sold as an upper only. You’ll need a compatible AR-15 pattern lower to complete the rifle.

Why choose the 18-inch barrel over a shorter option?
An 18-inch 6mm ARC barrel is built for reaching out further with more velocity, well suited to a precision or long-range-oriented build.

Buy the Radian Weapons Model 1 Complete Upper

Build out a long-range 6mm ARC upper with a complete assembly from Radian Weapons. Ships fast from a Lubbock, TX gun shop in our AR15 uppers lineup.