Quote:
Originally Posted by Zeroroaster
If you're using an SHS piston, or any other really, also check that it travels freely inside the mechbox without binding when it's back fully. I've had a couple where they go together just fine but once firing they bind up on the guide rails and create all sorts of goofy stuff in the gearbox. May not be the cause of what happened here, but something to be absolutely sure of.
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I have a feeling that OP was right all along and the piston head loosened itself and started to smack the cylinder when it was being drawn back in the gear cycle. If what lurkingknight says is true and evidence suggests it is, then the Element parts started to break under friction and the threads started to break after so many shots.
Also, if you're looking for some good rubber, some plumber o-rings will do just fine. Try looking for sorbo pads online if you're really adamant on paying for the extra quality, but anything from local home hardware stores usually have what you need.