Air is Leaking out of my gun!!!?!?

[QuestionMark?]

I have a Automag RT/Pro and i am using a 88ci 4500 PSI Nitrogen Tank made by Crossfire. Here is my problem, the first time i put the nitrogen tank in, i oiled the airline and did what i was supposed too, but after i put the nitrogen tank in the second time, nitrogen air began to leak at the point where u put the nitrogen tank into the gun at the bottem. This has happened everytime since i put the tank in except for the first time. I need help, everything works so sweet but this problem with my tank and the bottem of the gun!....i need answers to this big problem!

[Paintmonkey]

Check the oring on the tank, that is most definitly the problem, you will probably just have to replace it.

[11_Mile_TMaster]

And, Failing that, Go to your friendly local Paintball shop and ask for an ASA Saver. I know that my RT Pro uses those, and although they are nice in some ways, (I.E. don't need o-rings,) they do have a tendency to get loose/fall out.