hey guys. i recently made a pvc launcher that can fire either paintballs or 50 caliber blowgun darts. it uses an irritrol solenoid valve, pnuematically activated, and has a 3"x6" schedule 40 air chamber. I threaded a schrader valve into it and hooked a small bike pump to that. it takes about 40 pumps to reach 80 psi. it uses a 1/2" cpvc barrel for the darts and a 1/2" sch. 10 barrel for paintballs. At 80 psi, it shot a dart 3 1/2 inches into an oak tree at 45 yards. It is much more powerful than my paintball gun. If anyone wants to see pictures please email me.