The Radian Weapons R0898 Model 1 is a complete AR-platform upper chambered in 6mm ARC, built around a 14.5-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
• 14.5-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. An AR upper without a serialized lower isn’t a firearm by itself.

Can I put this on any AR-15 lower?
It’s built to mate with standard AR-15 pattern lowers, but note the 14.5-inch barrel is under the 16-inch minimum rifle barrel length — pairing this upper with a shouldered stock and a lower (rather than an approved pistol configuration) creates an NFA short-barreled rifle unless you hold an approved ATF Form 1 or similar authorization. Confirm your configuration is legal before assembly.

Buy the Radian Weapons Model 1 Complete Upper

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