The Cobalt Kinetics CK-Pro Upper Receiver Group in .300 Blackout with a 7.5-inch barrel and FDE finish (Cobalt Kinetics part no. CK-PRO-URG-300-75-B-FD) is a complete AR15-platform upper built for shooters upgrading a pistol-length short-barreled rifle build to Cobalt Kinetics’ performance standard. Every CK-Pro URG in this configuration is hand-built by Cobalt Kinetics’ own gunsmith staff and test-fired for function before it ships, giving builders the same fit and reliability found in a complete CK-Pro rifle. The 7.5-inch .300 Blackout barrel length is a popular choice for compact, maneuverable pistol builds where the shorter overall length matters more than long-range reach. Finished in flat dark earth, it’s built to bolt onto any mil-spec AR15 lower receiver.

Key Specifications

• Chambered in .300 Blackout, a caliber built for compact-barrel AR platforms.
• Fitted with a 7.5-inch barrel for a short, maneuverable pistol-length build.
• Finished in flat dark earth (FDE) Cerakote for a durable, distinct look.
• Assembled and test-fired for function by Cobalt Kinetics’ gunsmith staff before shipping.
• Machined to mil-spec dimensions for compatibility with standard AR15 lower receivers.

Frequently Asked Questions

Is this a complete, built upper or a stripped receiver? This CK-Pro URG configuration is a fully assembled, test-fired upper.

Will this bolt onto a standard AR15 lower? Yes, it’s machined to mil-spec dimensions for compatibility with standard AR15 lower receivers.

Buy the Cobalt Kinetics CK-Pro Upper Receiver Group (.300 Blackout, 7.5-inch FDE)

Get a gunsmith-built, test-fired .300 Blackout upper ready to drop onto your build. Order it from our Cobalt Kinetics lineup of AR15 uppers and our Lubbock, Texas team will get it out as soon as it’s ready to ship.