RISE Armament is committed to quality and success, and you can see that in their weapons. All RISE parts are manufactured according to strict AS9100 and ISO9001 2008 certified procedures, and must pass stringent QA inspection before leaving their facility.The RISE Armament Upper Parts Kit is a MIL-SPEC kit containing the small components necessary to assemble an AR-15 lower receiver.Kit includes:Forward assistForward assist springForward assist roll pinEjection port doorEjection port door springEjection port door pinC-clip