AKmountaineer
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A few months back I acquired a bunch of used gear which included about 6 different spearguns most of which are pneumatic. I did not really have a good grasp on how to use the pneumatic guns so I went into my LDS for information. They told me to stick the pump in the back of the gun and pump away until the pressure became too strong to pump anymore. Well, I followed that advice and everything was going fine, but then all of a sudden the rear valve just opened up and released all of the recently pressurized air. Any further pumps immediately leaked out the back. Does anybody know what's going on here, or have some tips on how to use these things?