Fx streamline oring?

I don't specifically own a streamline but can make an honest and reasonable guess. It may be the free floating hammer system FX is known for which acts as a no bounce hammer system so the gun doesn't waste any air after every shot. Does it make the sound like a loose chunk of metal that slides back and fourth inside of the receiver when you tip the gun up and down? If so then it may just be normal and nothing to worry about in your case.

CA
 
No it’s the shroud, it’s a really high pitch metal on metal. When I remove the shroud the rattle goes away, I can tap on it and it rattles like crazy. It’s just sad that I’ve complained to the dealer about it and been ignored and asked fx USA about it and same result. So basically I’m wondering if they all do it or if mine is missing an o ring and no one wants to send me one.
 
I probably will once I get done setting this up unless the streamline just collects dust. 
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