Cobalt Kinetics(R) CK-Pro Upper Receiver Group is an AR-15 upper assembly chambered in 5.56 NATO with a 14.5 in barrel and Black Cerakote finish. Built around a precision-machined billet aluminum upper receiver the assembly incorporates the proprietary S.I.M.S. handguard mounting system for improved structural rigidity and consistent alignment. This configuration is designed for compatibility with mil-spec AR-15 lower receivers.Key Features14.5 in barrel chambered in 5.56 NATOCK-Pro upper receiver group for AR-15 platforms7075-T6 billet aluminum upper receiver constructionBlack Cerakote finishProprietary S.I.M.S. self-indexing handguard interfaceEnhanced barrel mounting system with proprietary jam nutCompatible with mil-spec AR-15 lower receiversUpper receiver assembly does not require FFL transferCobalt Kinetics(R) develops precision-engineered firearms and components for modern sporting rifle platforms. The company emphasizes innovative receiver designs advanced machining techniques and carefully controlled manufacturing standards. Cobalt Kinetics produces products focused on structural integrity dependable functionality and refined firearm engineering.