Mosfet V3 Above the GearboxDescription Precisely and professionally made drop in MOSFET system designed for Airsoft Electric Guns with V3 gearbox installed in the AK type replicas. This system increases the AEG's rate of fire and limits unnecessary battery usage. In automatic fire mode, the piston stops in a random position due to the gearbox design. For proper operation, it is necessary to have a functional gearbox cut off lever, selector plate, reverse latch, trigger, and