In your original description "The hammer doesn't always drop when the triggger is pulled. You can feel a very distinct 'click' but nothing will happen." -- so firing did not happen, barrel, bolt lock, rocker plunger did NOT move. Nothing pushed sear arm away from the trigger and the trigger disconnected from the sear arm simply by pulling it (I guess that's where the 'click' came from). Trigger and sear arm fitting is needed on this gun, so the trigger won't disconnect by itself before the sear is raised high enough to release the hammer.
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