Retro Arms CNC QSC Gearbox Shell M249/PKM (8mm)

CNC gearbox designed for M249 or PKM airsoft replicas. This gearbox is manufactured from one solid block of aircraft aluminum (Dural) EN AW 7075 T651, which has higher strength (590MPa), than common construction steel (390MPa). Because of used material, our gearboxes have the best durability and resilience than common zinc-aluminum gearboxes. We are manufacturing these gearboxes on our precise CNC milling machines in our factory. Detail in bracket (8mm) means diameter for bushings/bearings. Package includes: CNC Gearbox M249/PKM (8mm) –  set of screws. We made some useful improvements into our CNC M249/PKM gearboxes: Spring holders have grooves, so the springs for tapped plate and trigger switch will not jump off. Sockets for bushings/bearings have smaller diameter about -0,02mm (7,98mm), for non-overturning the bushings during installation. The socket edges are cutted down for better installation. All threads are now shaped instead of cutted for better strength. Both of the gearbox