Airsoft Surgeon gives you freedom and allows you to break free from using the factory M4 PTW crane stock for storing the battery. This miniaturized ECU system by Airsoft Surgeon replaces the larger factory original ECU. The original ECU is 76mm long while this Airsoft Surgeon version is only 40mm long. That's almost a 50% reduction in length! Storing this smaller ECU unit in the factory stock tube means that there is room remaining to store a LiPo battery in the remainder of the stock tube. This means that you will not have to store the regular Systema battery in the factory CRANE stock, and so that you can change to using ANY other stock on the market.
The Airsoft Surgeon Miniaturized ECU performs exactly the same as the slightly larger 2008 boards. It also performs better than some other miniaturized boards out on the market since this board has better heat dissipation to avoid overheating.
Watch this video below to learn how to install the ECU in your Systema PTW's stock tube.
With the Ver.2 ECU from Airsoft Surgeon installed, you'll be able to fit a SOCOM Gear 7.4V 1000mAh Li Po Battery (10C Short Stick Version, AK, MP5, M4 Tube Series), or a SOCOM Gear 11.1V. 1000mAh. Li Po Battery (10C Stick Version AK Series).