The ACE Line Hawk Series from SRC feature and electronic trigger and in this video they show how one can use it. The ACE line Hawk Series are the compact AEG series that are based on Pistol Caliber Carbines (PCCs). They use stick type batteries and are made of Aluminum CNC Hanguard and receiver and adjustable stock.

Cisco, in this Airsoft GI Uncut talks about the Classic Army CA4A1 EC2 AEG. This AEG now comes with Electronic Control Unit or ECU which, according to Classic Army, not only protects your trigger contacts, but also has a trigger programmable 3 or 5 round burst fire function. Also, this AEG is Lipo ready.