[Spartan151]

Well, I've been tinkering, looking at Fusion's setups, and I've come up with my own design. Now, I wouldn't go replicating the idea I'm going to post if I were you, not until I give some feedback on how it did.

Here's the setup. I took a two foot long, 3-inch PVC pipe, added a 3in. coupler, put a 3-to-1 1/2 reducer, then a 1 1/2 to 1 reducer, to fit the Rainbird Sprinkler Valve. The Sprinkler Valve electrical system I'll explain later.
keep in mind that the PVC IS NOT USED FOR AIR STORAGE AT ANY POINT ON THE GUN! the only time it comes in contact with air is when the gun fires, and even then it's triple-reinforced in the joint sections, and I made sure to take an extra careful amount of time while assembling it.

Next, I plan to get hold of some tubing that can be pressurized to at least 110 PSI. This will enable me to have a variable adjustment rate without a risk of bursting. The hose will run to a connector, which will be tapped to an old Freon tank, much like Fusion's design. The tank will have a fill nipple, a pressure gauge for the tank, a hand valve for on/off, a regulator, another gauge for the regulator, and then the place to mount the hose.

As for electrical, I bought one of those little black boxes from Radio Shack, took a toggle switch (One of those that has a protective cover over the switch to prevent accidental turn ons). this switch acts as a safety. When this switch is on, a red light on the panel part is on, and a bright blue light powers up on the side. two of the 9v batteries are inside the box, and one 9v is outside of it attached by a "cradle". This allows me to pull the battery off for mainenance purposes, or simple power down. Next, the wires run to a "trigger" setup, and then to the solenoid wires itself, for activation of the valve.

Again, I wouldn't recommend attempting this until I have posted back with lots of feedback and testing results. If you do, okay, but I hope you take the time to think things through. I don't want to hear of someone getting hurt because of my design. Better me than you. Good luck, cannoneers.