In this livestream video from Patrol Base, they feature Double Eagle M904E Fire Control System Edition AEG that is available at their store... "This lightweight and incredibly effective Airsoft Electric Gun is powered by a Battery in the Stock, and features Double Eagle's Fire Control System, which allows for programmable Trigger Modes (including Binary Fire), as well as giving you excellent Trigger Response. The package is completed by a Quick Change Spring System, making it suitable for just about any field! If you want to be light on your feet and as effective as all the 'modded/custom guns' without having to break the bank, the Double Eagle M904 Falcon Fire Control Series are the perfect choice."