TargetTalk

I forgot to leave the pistol without preasure in a flight.
At present it has loss of preasure, I do not know is the pistol or the containers.
Wich will be the most probable o-ring to fail?
Where is locate it?
Please give some indications and tips to replace it, and if it is possible with clear diagrams, because in Chile there are not technitians to fix the problem.

Thank you for the help

Ramon

Firstly:-

Which model is the pistol?
- Fixed tank or Removable tank?
- If removable, is it an early or late model pressure gauge?

Secondly:-

Does the pistol leak only with the tank fitted to the pistol?
or
If removable, does the tank leak off the pistol?