Convert your semi automatic stryfe into full auto. Can be installed with separate battery tray or wired directly to the main battery.

On 2 ultrafire(around 8V), it can do 7+ darts per second. 3 ultrafire setup should bump it up to 11-12 darts per second.

P/S: This is a DIY kit. Installation video:(credits to psykSG)

https://www.youtube.com/watch?v=T8e_bbTY7RE