If I were to use this, I would have it a little different. First, it would be connected to a large source of water (Large water tank, lake, spring, etc.), which means no onboard res. It would be a two man blaster, with one person that has a bike pump-like thing (only it pumps water) with an electronic pressure gauge, so he would know when to stop pumping. The second person would have two side-by-side handles, each with two triggers. I would use the top two pressure chambers for long range soaking, and the two below would be short range, but high output to get them soaked before they get past. I think the reason for two pressure chambers is so that if one runs low, you still have another pressure chamber still full. (This would rarely happen, only if someone is messing with the guy who is doing the pumping, and he has to chase him off.)
I wouldn't bother with a QFD, because if there was a hose around, I would rather use the hose for this job.
Also, instead of CPS 2000 bladders, I would use double-layer(Or triple-layer if you want to go that far) LRT, each 1 ft long. That would give it incredible shot time, and with dual chambers, you would have a lot of water to unleash.
And CA99, you could have a coupling device to make it one stream, if you'd like. Would give it a very high boost in range. A MXL that was modded to have 1 nozzle selector instead of two got 50ft range, no colossus-ing.
I know this is a really old topic, but I thought it was interesting and thought of some ways to make it better. (I have been thinking about this for a while)
My avatar changes to which water gun I am most excited about.