No modding yet, but here is a juicy patent to feast on from tippmann regarding a more full-auto friendly design...
US Patent # 7665396
I've gotten to shoot it now with paintballs, and the consistency over my new Chrony F1 is pretty good - staying between 275 and 300 fps pretty much.
Thanks to this little piece I just ordered, I'll be able to weld up a "micro" tank now with simple 1/4 NPT female threads to adapt to my gun. I'm planning on making a tank that can hold about 12-15 grams of propane for our "stock" games.
Here is a great review on the gun ,
as well as an awesome disassembly
Here as some photos of the gun apart for anyone interested.
Overview of ignition system
Limitations I see - only allows 4 balls per second timing. therefore if you are a good pumper (as I am) and can squeeze off a snap shot with two shots being fired under .25 seconds, the ignition will not allow you do this. I'd like to reverse engineer the board or just use a small stun circuit (as that's all this is...) and get rid of the cycle time limitations and instead incorporate a reed switch that will only allow the shooter to fire the gun when the pump is in the full forward position - this will allow "auto-pumping" as well as get rid of the chance of mis-fires from the current system which has the spark system independent of the pump system.
close up the ignition board
::EDIT:: - now that I look at the close up closer the 555 chip is there just as an oscillator most likely to control the ignition coil. I can probably use the coil on there (with the number 0540 on it) and feed in a pulsed current for my own circuit.
valve assembly 1
valve assembly 2
Here you can see the valve which sits in the valve body. This is a very cool design and features a hard Teflon o-ring which seals the chamber in a static position. The rear silicon o-ring on the piston seals the combustion gasses from exiting the overpressure ports on the valve body unless absolutely necessary. The valve body exit port is square so there is a linear increase in surface area for chamber pressure. The red material on the front of the valve body is the silicone seal flap which seals the chamber during combustion, but during the forward pump stroke allows fresh air and a metered amount of propane in. I've already got a sheet of this same material I've been fooling around with to make high temperature seals, so it's comforting to know it's use here.
close picture of the flap
Here's a picture of the chamber extrusion profile, with a AAA battery to give you an idea of the wall thickness
Here's the barrel and bolt assembly
And finally - I was going to try and salvage a male threaded valve off a disposable tank by de-silversoldering it, that was until I found one manufactured lol... here's what the inside of a disposable tank head looks like.
