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what is happening is your solenoid is not seating properly. this is allowing the air to escape (the process that happens to allow the marker to fire) The reason your hearing the noise when you pull the trigger is because either the pressure is too low to close the noid or the noid has some grime in it and is not sealing properly.
There is no Oring on the bolt that would allow this leak to occure.
Either pressure is way to high or way too low. (try and set to about 160)
or
noid plunger is dirty. (don't lube it, just clean it if needed)
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