SpudFiles

Here's an idea for those who like to make mini's... perhaps it been done before but I didn't see it anywhere.

Take brake line and use it for the chamber. You can wrap it around the barrel in tight coils and it would hold far more pressure then what you could normally stick in copper pipe since they regular hold 3,000 psi or more during a panic stop...
I don't know if you can use regular compression fittings with it or how necessary you would put everything together but since the brake line could be bent and coiled into practically any shape under the sun it could make a more compact gun...

Its food for thought if nothing else....

Good idea but most people dont have a way to get to 3000psi which would make it kind of pointless. Anywhere under 1000psi power would suffer and the only reasonable way I can think of to get to 3000psi is unregged 3000psi nitrogen or other gasses.
I have attempted a chamber that small as I was working on a 6mm chambered combustion even with the very small syringe for a metering system it just wouldnt shoot except for one time it shot but power was so low that I just gave up on it.

It's an interesting idea but by comparison, a coaxial chamber rated to 3000 psi would be just as compact, easier to make and offer better potential flow, so it's not really worth the complexity.

Yeah it would have to be a pneumatic; the fuel wouldn't mix worth crap. I wouldn't suggest using it to 3,000 psi but 500 or 600 is within an acceptable range for a brake line. Since your volume will probably be small the you would want a high PSI.

If you build it right I thinking of a gun similar to a co axial that could shoot marbles with no more then a 3/4" or 1" overall diameter and a length of no more then one or two feet... I'm guessing on my measurements but it would be somewhere close to that...

The barrel would be 1/2 inch then you have the brake line coiled tightly around the out side to form the chamber... and in the back you rig up some sort of piston valve...

I like the idea because of the artistic capabilities.