I've recently installed a MOSFET but even before that, the fire modes haven't been working reliably. Right now semi-auto is working fine but as soon as I try full auto nothing happens. I've opened up the gearbox and haven't seen anything out of place. That being said, this is only my second time working on a gearbox. I've checked the tappet plate, cut-off level spring and it all seemed fine. Is there something I might've looked over?
The gearbox is a version 2 G&G electric blowback for the Airsoft GI G4-A2 blazing hog. It has lonex compression upgrades, 12:1 shs gears, flat trigger, and now the Gate NanoASR.
Update: I replaced the selector plate spring and it's working fine