thanks to everyone for your information. I contacted the guy and he is going to show me exactly what he used. He did have a pneumatic check valve that was adjustble to reileve psi at whatever it was set at. When i complete this gun, i will post it on this site.

thanks for the reply i beleive it had a mud flap check valve? I have built a few spud guns when i was younger and we used oxygen/asedalene from a torch for fuel. I really woudl like to embark on building a good pnuematic high psi spud gun. if you/anyone has any good plans please link me or email me ...

I was at a barbeque last year and a friend showed up with a check valve type of spud gun that i had never seen or built. Just curious if anyone had any deisgns for this or seen this. It looked like a normal gun but it had a hole in the end we filled with a blow gun from a compressor hose and when it ...