To prevent switch burn out when you use high power battery for your AEG...I know Systema make FTK kits with some kind of relay to reduce this problem.
there's also a mosfet switch that you can make on your own. It's shown on airsoftmechanics.com. KM and Angel makes one too for about $50.
Pygmy Militia Group
[quote="freq88"]there's also a mosfet switch that you can make on your own. It's shown on airsoftmechanics.com. KM and Angel makes one too for about $50.[/quote]