Cobalt Kinetics(R) CK-Pro Upper Receiver Group features an 11.8 in S.I.M.S. handguard and Flat Dark Earth Cerakote finish. Built around a precision-machined 7075-T6 billet aluminum upper receiver this AR-15 assembly incorporates a proprietary self-indexing handguard interface designed for secure alignment and consistent barrel mounting. The upper receiver is compatible with mil-spec AR-15 lower receivers.Key FeaturesCK-Pro upper receiver group for AR-15 platforms11.8 in S.I.M.S. handguard configuration7075-T6 billet aluminum upper receiver constructionFlat Dark Earth Cerakote finishSelf-indexing handguard mounting interfaceProprietary barrel jam nut mounting systemCompatible with mil-spec AR-15 lower receiversUpper receiver group 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.