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If it was just dryfiring and no BBs at all then it's likely that one (or a combination) of following things happened:
1. The lip of the nozzle seal was catching the edge of the cylinder when it went from fully retracted to moving forward
2. The overall collapsed length of the nozzle/piston body was too long...and it basically smushed itself.
3. The strength of the nozzle body was compromised by either machining the gas inlet slots too large (not leaving enough support) or its rigidity was compromised by improper heat tempering.
You should be able to just drop that floating valve into a different nozzle. Take care that you either clip the little cross-section of the spring off of the old nozzle or use the nozzle from the kit which differs from the stock one in that the cross-bar part of it has been clipped off already.
I smushed one too...from using too much heat to break the loctite and repeated jamming when I was goofing around with testing. Pics on page two of this thread.
Noob....where's your spacer in the bottom assembly? Is that how it was as pulled from the gun? Or just thrown together re-assembled for the pic?
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