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That sound is decompression of the CO2. Do you have an expansion chamber? If not, the sound may actually be the CO2 decompressing every time you shoot, because you deplete all the air from the marker with a single shot.
If that's not the problem, then it could be that the macro-line's opening may be too tight, and you're hearing the pressure squeeze through it.
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Can't fix it, duct it. Cant duct it, it broke.
This answered all my questions. READ
Pump Owner #20.
Quote:
Originally posted by W1ldK@t
College can come and go, but you can legally shoot people very few times
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