This is the new Stealth mosfet from AWS Airsoft:
LINK:
http://www.awsairsoft.com/stealth-v2gb#
VIDEO:
YouTube - AWS STEALTH MOSFET / ECU Testing Video
I'm also considering getting one for my future aeg, since the VFC scar doesnt have enough room for a classic mosfet and big batteries (so i'll go with Lipo + Mosfet), and also, this is a replica of the microswitch design seen in Systema PTW!
It beats the classic mechanical switch for sure!