Retroarms CNC processed 8mm spare gearbox case for ver.2 electric gun (quick detach spring guide)

New hi quality 100% CNC processed model available 
ideal use with hi power springs and intense hi speed full auto technology
comes with quick detach spring guide for fast spring replace 
unlike common parts the case is made by full material and worked and finished by use of CNC precision machines
thanks to the feature it combine incredible strenght with light weight (50% less of a standard molded gearbox)
quick detach spring guide and retain screws are also included
fits Marui, G&G,G&P, ka and compatible electric guns
ideal use for m16, m4, g3, mp5 series