Yeah, I saw goat's, those were pretty cool. However, those have handles attached to the bottom, coming down, instead of just an in-stock trigger. I suppose it could work if I turn it sideways, but I'm still working on the basics right now. Thinking that I'm going to get the pipe tomorrow, then get t...

A light, air powered launcher built to look like an M79 "Thumper launcher. Breakaway barrel, tire valve insert, haven't yet decided on the release valve style, but it doesn't need to be great. More important that the gun is recognizable than effective. Really the only reason I'm making a working mod...

A QEV may work if hidden in the stock. That's what I was thinking, and, granted, I have yet to go looking for QEV's that would fit, but the basic T shape will not work for the design. Edit: After looking at it, I now see what you're saying. If the pilot is pointing up, with the QEV backed into the ...

I'm building a launcher that's meant to replicate the shape and style of an M79 "Thumper" grenade launcher, breakaway barrel and all. However, there are a few logistics to work out, especially including the valve. The last cannon I made was a basic, 3"X1.5' tank - converters down to 1/2" pipe - half...

I just wanted to say, however many times you may have heard it, that is awesome. Anyone can build a 12 foot PVC aerosol-powered monster, but that is handheld, ergonomic, reusable, and serves a purpose other than gratuitous destruction of household appliances. I applaud you.

300-400 is huge for 1/4. PVC's fail point is somewhere near 400, to give you an idea. I don't know about the metals, but at that pressure, you're going to get a lot of condensation, and possibly even some frost on the valves. Frankly, it's a little overkill unless your going to be launching somethin...

Pressure chamber should be whatever will best contain the total amount of air at the right pressure. If you're using a compressor, that pressure is 150-180 PSI, a manual pump may get you to 120 at the highest. So it depends on what kind of barrel to pressure tank ratio is, and on what you're ideal P...

So is it used as a shotgun or do you have a uniform solid slug to fire? I think it would be interesting to have a single-shot to see what kind of range it has.