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Here is a picture of the gun i built.. It cost me 40 dollars to build, and i bought all of the parts at Lowes (Home Depot or any Plumbing store will have it).
When building a gun like this, make sure to use Teflon tape on all of the places where you are screwing the pipe together.. (that's the white tape stuff on the gun)
It is not neccessary to spend the money for the check values if your looking to do this cheap. They will be helpful though, so if you have the money, buy them. ( I didn't) The size's of your nipples are not seriously important either.