The AirTac VFC AK74 to M4 HPA Adapter is a fully assembled, plug-and-play conversion kit designed to run HPA on VFC AK74 Gas Blowback (GBBR) platforms using standard M4 AEG magazines. Featuring an updated spring-loaded moving valve knocker for unmatched FPS consistency, it comes pre-fitted with an outlet valve, gas router, and feed lips.