take the air line that doesnt have air pressure off the air ram if there is air coming out then the seals in the air ram a worn or damaged

yes they are indeed fire extinguishers . they were used at work intill for some reason they changed them all so just happen to have 20 of these! Large bore is the only way to go! downloaded GGDT last nite and filled it out and it tells me the the ball is going 157 meters a second is this gd? only 19...

thanks for posting that so it could be seen on here. i didnt know how to do it

hey sorry for the slow replys been one of those weeks! The piston is made out of so plastic bar that was at work with some o rings and rubber as the sealing face. And yes this is my frist cannon it did have a ball valve on it to i made the piston for it. here is the only vid i have of it shooting a ...

hey chamber to barrel raito is only 4:1 24 Litres chamber to 6 litres in barrel no vids yet always forget as its so much fun but will try and get some tomorrow

here is my frist go a a cannon made from all the stuff i found lying around. build cost $0

its a little heavy but for the price its fine! it uses a piston valve and so far has only been fired at 100psi .