With the halves separated, check the workings of the trigger mech to see that it's not jammed by a bb... I'm sure you checked there but I have to suggest it.
If the rattle is coming from the top half, it's probably a bb you missed, but I can't see how one would get so far in there... Check the movement of the black plastic nozzle, and the metal one it surrounds. And for a laugh, check your mag, and try a known good one instead. Shout back with any new info or even pics.
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