Ah, I see and no size of ball valve would allow me to release air faster than it was pumped in?

Mathematically, this could work? Extended section is the same size as chamber.

K edit... Strange, my post dissapeared and all that was left was a "k"...:? Here's what I was goin to say... If you want really reliable and not that fast, have you considered a mag fed pump action of sorts? And to fix the comp flow issue you could just have an extra big pilot... You are exactly ri...

you still will need either a really small amount of flow from the compressor or whatever to make sure you pilot decreases pressure enough to actuate the piston. You could use a needle valve or something but then you chamber would take a long to to fill and you piston would take longer to seal. Sorr...

Thank You! You're insight has been very helpful! I made a second version. I will try to refute your issues :P making the piston close before ammo has time to drop in : This would be operated at a low P.S.I, causing the piston seal slower, giving enough time for the ammo to drop in. If I did the math...

I like making things simple, which means more reliable. I just got into pneumatic spud cannons and I think its awesome! So I was looking at a lot of semi-auto designs and it annoyed me how you would have a dry-fire 2 out of 3 shots. Sure these were fast, but I wanted reliable :o This probably has so...