...Actually when you send the gun UPS or FedEx all you need to do is lower the pressure so it can handle the change in atmospheric pressure of flying.
...
???
Most airgun are rated for 2000-3000psi.
Another 8 or 9 psi from an unpressurized cargo hold will make little difference.
I could see draining all pressure for accident safety, but it would not be to compensate for "atmospheric pressure of flying".
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