Re: 254 Shockwave questions
 

For t-shirt shooting since you only need to turn the air supply on and off I am a fan of these valves. http://www.airbagit.com/Brass-Air-Va...irvalve-06.htm They do make them smaller too. They are cheap, completely rebuild-able, fast acting and are very simple and reliable. They do need a bit of power to operate, around 4 amps per valve, IIRC. They have smaller versions available too.

We used them in testing for our abandoned T-shirt shooter project and we were able to control the distance of the by the amount of time the valves were opened.

Re: 254 Shockwave questions
 

Not shockwave related exactly, but can lexan be used for the barrel?