TaBo wrote:why galvanized pipe and not just an iron?
if my chamber will be iron pipe and i'll have a blowgun connect to the chamber, it will be fine no?
I have never used iron pipe before so I do not know how it will hold up. Theoretically it should be fine though. If you do not have a regulator to reduce the pressure from 800psi to around 100psi, DO NOT USE A BLOWGUN. It is not designed for that kind of pressure. You will need a metal ball valve for firing and one for filling the chamber (chamber valve for increased efficiency and less waste (you don't have to have one but I recommend them)).