The collapsible stock has a miniscule amount of play in it when fully extended, although I doubt any MP5 is immune to that. In fact when I first got it, I had to exert FORCE on the stock opening and closing it because it was nice and tight. I still have to give the stock a good push closed, I usually use both hands on the foregrip and push the buttstock against my tummy!
The moving "bolt" in the ejection port doesn't rattle whatsoever. Cocking knob is a little floppy but it doesn't bother me. I still can't get over how heavy thins thing feels, I had to do a double take to make sure I hadn't gotten a real one by mistake!
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