The green pipe is rather large and thin and I don't remember if it has any writing on the outside of it.

I think the sch 40 330 psi pipe was about 2.5" or something, I was thinking of using it for a barrel.

My thoughts were that you could fill a pop can with concrete, or about 3/4 full with water and freeze it, and it should fit very well in a 2.5" barrel. Just wondering if anyone has ever used wadding and then put about 50-100 paintballs down the barrel? I would figure that either you would have a lot...

As long as its not cast iron, it should weld just fine

I have a few questions, about the safety of PVC and a few other things. 1st. Exactly how safe is PVC pipe, I have some 330 psi pipe, and I know not to use cellular core. I assume this would be safe for your basic combustion cannon right? 2nd. How do you install an ignitor so that fuel will not escap...