How to Modify a sprinkler valve for use in a spud gun
Check out these step-by-step instructions on how to modify a RainBird CP-100 Sprinkler Valve for use in a pneumatic cannon (spudgun). Or, if you so desire, you can put the modified sprinkler valve in a golf ball cannon like in this video (see the test shot at the end). Just get rid of the solenoid on the valve, pull the cover off, modify a few things, and attach your blowgun. Then, attach the valve to your spud gun, or golf ball gun, whatever, and see it chop through some plywood. This is very dangerous and could kill somebody, so don't attempt to build this weapon if you are an idiot.