If you're willing to consider using a back pressure style of tank (panther, xbz, big salvo, hornet...) you should be able to modify a shcrader valve stem from a bicycle tire inner-tube. simply pushing in the pin will vent the fill line to the tank and fire the tank. The threads on the valve stem might be useful for mounting the valve and you could also cut out some of the thread wall to guide a trigger bar over the schrader valve. You can also stretch some vinyl tubing over the back of the valve if you warm up the tubing first with a hair dryer (maybe), heat gun or carefully with a flame and double wrap a zip tie to seal it.
You might also want to consider the slightly less expensive MAVO-3. the cfm's are a little less but i've used them successfully on many of my air tank builds so they've proven sufficient for stock nerfy tanks (just keep the air line between the pump, trigger valve and air tank to a minimum. The shorter that line is, the faster it can vent and the sharper the tank's air release will be.
I don't know if the mjvo-3 will shut off the inlet before back venting the outlet but the mavo-3's will - which means they can be used to make a true semi auto. (they won't vent off your reserve tank with each trigger pull.)
Edited by shmmee, 26 July 2017 - 08:42 AM.
"and we should respect the people who make our blasters. Even if we do molest the hell out of them..."