I'll be entering the MCB "pile of poo" buildoff with an old broken Shoebox shocker. I think I can turn it into a pump for under $100.
Basically I'll be replacing the firing noid with a 2 or 3 way valve. I'll ditch the bolt noid and manually control the bolt with a backblock, and have a cocking rod thread into the dump chamber valve to open it and "cock" the gun. Meaning, it can't shoot at all without being pumped, not even dry firing.
Ordering for the summer run of Avratech Retro 7s is open! Made in Canada and anodized to order by the TonSixers.
I have to think back... some where a friend of mine did a pump PVi Shockers. he did it electronically, with two boards that ran either part of the gun and two trigger switches.
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You can actually remove the rod and fire the gun, I have done this just to see what would happen.
It uses an ungodly amount of air. I had a N2O tank on it for the test and it dropped approximately 50psi on the tank per shot. Very inefficient and you may have to shake the gun forward to get the valve to seal again.
I like your idea and I look forward to seeing what becomes of this hunk of aluminum.
I wish people would learn how their gun works before trying to troubleshoot a problem. On second thought, they should learn how it works before putting an air tank on it.