I was looking at the mega launcher pic. Also on other pneumatic guns I see the solenoid valve doesn't have a pipe going in one end. Why. I thought the air goes from the chamber through the solenoid when to press the button to the barrel. I just ordered the water sprinkler solenoid from spud tech today. I am making a pneumatic gun with a 2" barrel then having a 4" chamber over the barrel 3/4 of the way. I am then going to have a 4" tee with a 2" outlet that runs to the sprinkler then a line that runs into the barrel. This should work right?