Here is a more comprehensive review on the new EMG Noveske Gen 4 AEG that is available at Evike.com. This AEG uses the APS SilverEdge SDU 2.0 (Super Dynamic Unit) gearbox that features a micro switch trigger that works with the gearbox for a more responsive trigger response. It is programmable for certain fire modes, and comes with a Marui-compatible M4 AEG magazine.