With the EFCS gearbox from Ares/Amoeba airsoft freely available to buy separately to use in your own version 2 AEG projects, you will need the Ares Amoeba EFCS Electronic Programmer in order to configure the EFCS to change the firing mode system and also for Lipoly Battery protection. Here's a video how to use it, making it easy to configure the gearbox rather than relying on trigger pull.