Here is a howto video from Airsoft GI Uncut showing you how to program a 3-round burst with the Classic Army Nemesis AEG. The Nemesis, as well as the Scarab, are newer AEGs from Classic Army that are of their own design and come with MOSFET chips... "Check out this awesome function of the Classic Army Nemesis and Scarab guns!"

More about making MOSFETs for use in airsoft AEGs as AirsoftTech.dk shows you how to make a PCB board... "In the last mosfet video I showed you how to make a burst mode mosfet. In this video I will take that one step futher and make a custom PCB board for the electronics.

So no more loose wires looping over components."