Originally Posted by Eeyore
Tippman did release a propane powered marker but it was a spectacular fail as it had no shot to shot consistancy.
I have one of the markers you mention, the C3. It doesn't use the expansion of propane, but rather the combustion of it to propel the paintball. And actually, once it 'warmed up' (literally) it shot pretty good. I hear the reason they didn't move forward with the idea into semi automatic is that there was excessive heat build up, from the combustion. Too bad as I think it's a really cool idea.