Built-to-order 6mm ARC upper on the Ascend Phoenix billet receiver with an 18-inch Helix 6 carbon fiber barrel.

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Next Level Armament Phoenix AR-15 6mm ARC 18 inch Upper Receiver Helix 6 Rifle Length 1-7 Twist Muzzle Brake Anodized Black
The Phoenix 6ARC Premium Complete Upper is the upper half of Next Level Armament's Phoenix 6ARC Premium rifle, sold to drop onto an existing AR-15 lower. It is built on the Ascend Phoenix billet upper and chambered in 6mm ARC, the cartridge Hornady developed for the AR-15 to reach farther than 5.56 with manageable recoil.
The barrel is an 18-inch Helix 6 carbon fiber barrel, lighter than a steel barrel of the same contour, paired with Next Level's DLC bolt carrier group, its Scythe ambidextrous charging handle, an NLA handguard, and an NLA muzzle device. Each one is custom built to order, so Next Level asks for about 10 days before shipping. Use 6mm ARC magazines in the lower.

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Add the Next Level Armament Phoenix 6ARC Premium Complete Upper (18 in Helix 6 Carbon) to your build and see how it enhances your platform.