If in fact PVC is incredibly dangerous I have a few questions.
The discussion here has been only about air powered guns. Is there any greater or less danger in combustion guns? ( I'm aware that this would be disallowed on school grounds, its just a question of principle) I imagine that the lack of high pressure storage gives some what more safety though there is more of a spiking pressure affect that could counter act this.
Also on the topic of air cannons what are peoples opinions on the below link?
http://www.spudfiles.com/
I realize that it is the internet and not a well researched set of standards but one must question the danger involved if there has been a large community of people using these devices for years now. They have there share of accidents (as does any hobby such as dirt biking or snow boarding, etc) but it would seem that they only happen to people who didn't follow the well known safety practices and construction techniques established over time by the general spudding community. I guess that that if PVC were as dangerous as we are discussing then most of these people would have killed themselves by now.