Leaking air after Shots

[pbg1]

Leaking air out power tube its seems after sometime 1 shot or a few shots....
using Co2 of course......been having problems w/ on/off button....put old on/off in was working ok....then to much Co2 going thru reg. started to freeze.
after which leaking air ................I under stand if reg. freezes up....will leak air when piston locks........I let gun warm back up before testing again....

thansk all

[Janitor]

been having problems w/ on/off button....put old on/off in was working ok

Are you using a new on\off or something?

[pbg1]

the OJ that came with gun............
i had replaced it 2 yrs ago with parts kit.......
The parts kit one will not allow the gun to fire....
the pin really tight.......put old one back in allows a few shots
then leaks air out power tube. ....it starts trigger push air leaks
then stays leaking......