Well, after an hour or fiddling with the Airsoft and checking tutorials online, I figured how to remove the Gearbox assembly from the rest.
However, when I tried to remove the Gearbox from the Grip, it looked like this:
As you can see, on of the wires is being blocked by the Safety lever...
Am I missing something or I need to break the wire in order to get the Gearbox out?
Also, while I'm at it, should I split the wires from the Gearbox to the Barrel with any type of connector to allow an easier disassembly next time?
The whole wiring looks like a mess from my perspective.