I had that problem with a hopup rubber that improperly fit the barrel and nozzle, it'd short stroke and jam. Got a new KSC rubber and I was back in business.
EDIT: This was also in addition to the pin holding the valve in the nozzle drifting out and binding against the nozzle housing.
Last edited by MaybeStopCalling; June 4th, 2013 at 14:30..
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