I built one of those for Heartstoppers, which I think was associated with POE at one point, or may still be. Who knows, could have been the one I built. Anyways, not a paintball gun, it was a single valve air cannon with a 1/2" rubber hose from the output of the valve up thru a fake gun. The trigger being a momentary switch to turn 12vdc on and off to the valve. When I get to my haunt tonight, I will look for a picture of the air cannon. If you can acquire a fake gun, building the cannon is a piece of cake.
Originally Posted by asanve