Cobalt Kinetics 6.75in CK-Pro Stripped Upper Receiver Group Flat Dark Earth Cerakote. All CK-Pro URGs are expertly built by our gunsmith staff. Built URGs are test-fired for function before leaving out the door to the customer. Upgrade your current platform RUN COBALT Specifications for Cobalt Kinetics 6.75in CK-Pro Stripped Upper Receiver Group: Manufacturer: Cobalt Kinetics Color: Flat Dark Earth Finish: Cerakote Package Contents: Cobalt Kinetics 6.75in CK-Pro Stripped Upper Receiver Group Cobalt Kinetics CK-Pro Urg Aluminum Flat Dark Earth Cerakote Receiver CKPROURG675SFDE