SpudFiles

Here is a video. I ran out of co2 a couple shots in so the video is really crappy. The first shot is a different clip. The tank wasn't filling very fast in 2-4 because the psi was so low but at least you can see the evidence. These shots were probably going around 150-200 fps. Much better than before.

video

The basic idea is sound, all you need to do is refine it a little and I'm sure you'll have a powerful semi-auto that will fire as fast as you can pull the trigger.