Airsoftjunkiez got news that the PolarStar JACK TM MP7 Drop-in Kit is available again at their store. Designed by Bingo Airsoft Designs with Airsoftjunkiez branding, this is designed to fit the Jack FCU to the Tokyo Marui MP7 AEG to have it HPA-powered. It has a custom 3D printed MP7 chassis for the engine and has a full auto microswitch and mini connection circuit board.