Okay, I have narrowed it down to part #35
I've started by getting the gun stock again. Problem still happens but I've got a bit more of an idea, still looking for suggestion.
If the trigger is held in the fire position, and a magazine inserted, the trigger is locked in the fire position. If you press the magazine release, only the slightest wobble of the mag will return the trigger forward.
I'll keep updating as I go..
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