When this happens you need to reassemble the gearbox and put it in the lower receiver and shoot full-auto. I can't explain it but it essentially puts the cutoff lever back to the default position so that it stops your trigger from skipping out of its cage.
If that doesn't work you need to reposition the gears a certain way so that it stops the cutoff lever from engaging the trigger half-way.
I did this with my g36c a couple of times... PITA.
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