[TubaMorg]

Aha! Now I think I've got it, sort of. There are still some details that aren't clear. If no air leaves or enters the big cylinders, then it is a closed system. How do you know what pressure exists on each side of the cylinder? Also if the bottom is at 60 psi and the top is at atmospheric, then you must have a latching mechanism that keeps it from flinging the ball until released. You must then also have a mechanism that "recocks" the cylinders. I believe the GDC has ruled on this and said it is a no-no. If you had pressure gages installed to the top and bottom and could show that 60 psi would not be exceeded, maybe it would be ok. I admire the creativity you guys have though! Have you considered using gas springs instead? They are way FIRST legal and have lots of sproing.