I take mine apart for fun, there are 4 pins. 1) the rear pin goes through the rear of the mechbox
2) the Flora Pin is right above the trigger. 3) Mag catch is a Hex screw (1.25mm i think) 4) the front pin connects the upper receiver to the lower. Now for the screws. there are also two locations four screws. 1) the motor plate remove those. 2) Next unplug the wires from the motor and slide it out. there are two more screws. the final location is the in the stock; idk if you have the solid or retractable one but its the same, take your longest screwdriver and stick down the tube, its a Phillips head fyi and remove. If your have done all that the mechbox should come out. I hoped this helped