The RWA BAD556 comes equipped with the Gate Electronics Aster MOSFET and is available at Orga Airoft where they show you how to set it up in this video... "RWA (Redwolf Airsoft) BAD556 electric gun that is the distributor in Japan at ORGA AIRSOFT! By default, this product is equipped with a GATE ECU, a so-called electronic trigger, which allows you to change the combination of shooting modes and the behavior during bursts.