The Cobalt Kinetics CK-Pro upper receiver group (MPN CKPROURG556145BLK) is a complete AR-15 upper assembly chambered in 5.56 NATO with a 14.5-inch barrel.

Key Specifications

• Cobalt Kinetics CK-Pro complete upper receiver group
• Chambered in 5.56 NATO/.223 Remington
• 14.5-inch barrel length
• Aluminum receiver construction
• Black Cerakote finish
• Built and test-fired by gunsmith staff before shipping
• Designed to upgrade existing AR builds to CK-Pro performance
• Expertly assembled by hand

Frequently Asked Questions

Does this include a lower receiver?
No, this is a complete upper assembly only; it ships without a lower receiver or fire control group.

Are there legal restrictions on this barrel length?
At 14.5 inches, this barrel is under the 16-inch federal minimum for a rifle-configured (shouldered/stocked) firearm. It’s intended for a pistol-configured (braced, no stock) build. Installing a sub-16-inch-barreled upper on an already-assembled, shouldered rifle lower without prior ATF Form 1 approval creates an illegal, unregistered short-barreled rifle (SBR).

Buy the Cobalt Kinetics CK-Pro 14.5in 5.56 Complete Upper

Drop a gunsmith-built 5.56 upper onto your pistol build with this assembly from Cobalt Kinetics. Ships fast from a Lubbock, TX gun shop in our AR-15 uppers lineup.