would I have to put something to make it snug or would just having it covering the hole suffice? I think I might just buy some paintballs and take one to the hardware store and do a fit.

quick questions, how well will a 1/2 copper barrel work? I'll use PVC if I have to, but my cannon is all copper right now and I'd like to keep it that way. And if 1/2 copper works, how can I fashion a breech loader for it? I don't have fancy tools and machines, so the simpler the better.

gracias. But what's SDR 13.5 mean?

forget it, found out. THanks

I made my cannon with a removable barrel for just this situation. I want to start shooting paintballs, but I have no idea how big they are and what size piping I should use. I'm cheap as hell so before I hit the stores I want to work a budget out...help please?

I know how the piston valve works, the concept behind it...that's about it. How to incorporate it into my copper cannon, I have no idea...how to build it, I have no idea...essentially, I have a simple ball valve copper cannon, and I want to make it better

I appreciate the attempt, but it is confusing, especially when you put that "beginner" "advanced" and the other one kind right after each other...I would suggest you do an instruction for one type of piston, with a numbered step by step process that has pictures to go along with each step...also, a ...

awesome, thanks for the directions...any help on the gauge?

I just want to start this off by saying I have no experience building stuff, so for me to actually have a working copper cannon is an accomplishment...now that I have it working, I want to make improvements, but I don't want to do anyhting that would set me back now that I have it working. SO, my qu...

I live in the US....but I used the search function and the only thing I could find was to order it from mcmaster.com, but they don't carry that type, and the closest one I could find to it was 3/4 inch...

where do I get one like that? that's the problem I'm having right now.

sorry for the double post...and I'm not trying to bump either, but I saw that someone made a QEV, or a piston valve, whatever it's called, out of some rubber gasket things, a bolt, and ring made out of tennis ball inside a copper tee....it seems simple to make, but I couldn't see the inside of the t...

anyone know the shipping cost for one of those to Los Angeles?

here, so you guys can get a visual on what I made...it's standing about 8 feet tall... maybe 9 feet...

http://farm4.static.flickr.com/3195/239 ... 62f6_b.jpg

another questions I have is can I pick one of these up at a hardware store? or are they a specialty item that has to be ordered?

are you almost done with this? if you get it to work, and work well, let us know, I'm interested in making one.