Originally Posted by Rusty Lugnuts
unless i'm mistaken, ICS makes an m4 that has a Two piece gearbox so changing the spring is a snap. I believe that the gears, trigger assembly, motor, wiring stay in the lower half of the gun , the spring and piston come off with the front section, . I'm not sure because my son has never had to take his apart.
Exactly, the ics split gearbox is not exactly a quick change, but it is very to do a spring change.