AirsoftFlow: Airsoft Reviews, Tutorials and more!: Modifying your ... | Airsoft | Scoop.it
They are used in all M4 - M16 and Mp5 bodies. find more about this gearbox at http://www.airsoft-barracks.com/forums/topic/2376-gearbox-versions-and-compatibility-guide/. Version 3: The version 3 gearbox is not quite as ...