I had a similar idea:

http://www.geocities.com/man_o_brass/golfball_gun.html

I'm assuming that this is for a sprinkler valve. I use three 9-volts in series and it works just fine.

Yep, Autodesk Inventor 10. Great program.

Someone with a mechanic buddy needs to ask to borrow his cylinder compression tester and just hook it up to a gun. They're designed to do this exact thing. My brother's got one, but I really don't have the time or inclination to mess with it. (edit) Here's an example: http://www.northerntool.com/web...

Word to the wise: Fiberglass resin will dissolve the bejeezus out of polystyrene.

You can easily use PVC with 12 gram cartridges if you make the chamber big enough for the CO2 to expand.
For example:
http://www.spudtech.com/content.asp?id=22

Anyone know if Autocad files are compatible with Autodesk Inventor? That's what I have access to and have used with great results on a few gun designs. Modelling fittings is a bit of a pain, though.

2" SCHD 80 works wonderfully. Depending on the manufacturer, you might have to sand out the 2" a bit for it to slide over nicely.

You wouldn't need two compressors if you put a cutoff (ball valve) on the pilot of main valve. That would isolate the pilot valve from said chamber and allow them to be filled one at a time. The only problem might be a sudden pressure fluctuation when you opened the valve, but that could be remedied...

Perhaps someone else can help, but I'm going to need a better description or a picture before I know just what you're describing. Can you give us some more details?

(sigh) Like i said, if your design is linear as the picture shows, the endcap of the CHAMBER will experience the recoil. With the barrel clamped, EVERY fitting of the gun will be subjected to EVERY bit of recoil force. If your goal is to avoid stressing these parts, clamp the chamber down and take t...

Here's the simplest one I've seen, made by Brass Eagle and costs ~$20: http://paintballgi.com/images/view.aspx?imageUrl=/ProductImages/airsystems/38-1-quickchange.JPG Two pieces, one's got a rubber seal with a hollow needle in the middle of it, the other holds the cartridge and screws down over the ...

but 400 is sooo much fun! :D Yes, I'm sure it is, but it's also not something the compressor is designed to do. It's double the normal loading, and 100 psi over what would be considered a serious problem in an automotive system. Run whatever you like through the bloody thing, just don't come back h...

While I've never tinkered with a refrigerator, automotive AC systems are designed to operate under 250 psi. I wouldn't imagine a refrigerator to run any higher than an AC system, so 430 psi is probably well over what the compressor was designed to handle. Pressure systems are designed with a factor ...

I'll put it this way. If you looked down the barrel. whatever part you saw at the other end is the only part that will be pushed on by recoil. That one part will then pull the rest of the gun back with it. There can be other forces created by gas turning corners in angled fittings, but they aren't m...