Co2 shifter?

I've done searches and can't seem to find anything on a DIY co2 airshifter. Anyone built their own?

I've looked at dynotune's kit and mps's. Any suggestions or feedback I would greatly appreciate it. I'm absolutely clueless when it comes to airshifters
To be honest I give them to build it and I ride it. But I do use the CO2 bottles from my paintball gun to shift my bike. They cost $14 brand new field or you can get one from schnitz for125 bucks
 
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