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If you must release the gas, release it through the same port it went in (like babies :P ). Use a small pin, or stick, or similar object (I've often used a dummy 5.56x45 when I'm testing guns at home, cuz I have one right next to my work area) Just avoid exposing your skin directly to the gas being vented (cold).
Also, for CO2 guns, don't leave gas in it for a prolonged period of time (even overnight); CO2 will freeze/harden your seals which will then leak and be empty when you want to use it.
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