The Radian Weapons Model 1 18-Inch 6mm ARC Complete Upper arrives assembled and ready for a lower (Radian part no. R0905). It pairs an 18-inch barrel with a rifle-length gas system, a 17-inch M-LOK handguard, a Dead Air KeyMo muzzle brake, a Radian Raptor-SD charging handle and a Radian Enhanced bolt carrier group. The whole upper wears a gray Cerakote finish. This Radian Weapons upper suits precision-minded shooters who want a long-barrel 6mm ARC rifle for the range or for hunting.

Key Specifications

• The chambering is 6mm ARC, which determines the ammunition this upper must be shot with.
• Barrel length is 18 inches, a long barrel that gives the cartridge room to build velocity.
• The twist rate is 1:7, which sets the bullet weights the rifling will stabilize.
• The muzzle device is a Dead Air KeyMo brake, mounted on the barrel at the factory.
• The gas system is rifle length, matched to the 18-inch barrel.
• The handguard is a 17-inch M-LOK design, with long mounting space for a bipod, light or sling hardware.
• The charging handle is a Radian Raptor-SD, supplied on the upper.
• The bolt carrier group is a Radian Enhanced BCG, installed so the upper is complete.
• The finish is gray Cerakote, a durable coating that resists wear and corrosion.

Frequently Asked Questions

What is included on this upper? It is a complete upper: the 18-inch 6mm ARC barrel, the 17-inch M-LOK handguard, a Dead Air KeyMo muzzle brake, a Radian Raptor-SD charging handle and a Radian Enhanced bolt carrier group.

What cartridge is it chambered for? It is chambered for 6mm ARC and should only be run with 6mm ARC ammunition.

What color is the finish? The upper is finished in gray Cerakote.

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

A complete upper takes much of the guesswork out of an AR build, and the long 6mm ARC barrel here leans into accuracy. Order it from our Lubbock, Texas gun shop for fast, insured shipping, and browse more AR-15 uppers to round out the rifle.