SpudFiles

this is my design for a marble gun. i wanted to see what everyone thinks before I build it.

this will work but each time you will loose pressure. You will go from 90 psi one shot then to80psi one shot to 70psi.

Your general concept is good.

You should do some research on the magazine-fed breech loaders people have built around here. Personally, I prefer the BC-arms-style bolt action.

Using a QEV or modified sprinkler for your main (second) valve will greatly increase performance. Also, I'd suggest making the gun's built-in air tank as big as you can stand to.

Instead of a ball valve to let air into the gun's tank from the compressor, why not use a cheap air regulator or check valve so that you don't have to open the valve between shots?

Peace,
Pete Zaria.

it depend on the compressor, the ball valves may prove unimpressive. sprinkler valves will not work if they receive a sudden blast of air they wil not shut automatically. a good way is to have the fill valve replaced with a needle valve or flow regulating valve and the second to be replaced with a sprinkler valve if you like. now for the loading system you must have a plan on that or else they will just all blast out at once, so you must use a loading paddle system, or a blow-forward bolt you should research both in fact I'll help

heres the best paddle example i could find http://www.spudfiles.com/forums/full-au ... t4108.html
heres a good blow forward bolt example
http://www.spudfiles.com/forums/viewtopic.php?t=160&