Rattles on every buffer tube I have, annoyingly so. I have a couple LMT's, BCM mil-spec and a tube that came with a knock off fiberlite stock kit that is normally so tight you need to hammer on and off stocks.
In my pile of stocks I have an out of spec CTR that does the same thing too on all my tubes for whatever reason. I'll never buy anything other than LMT stocks and tubes, or Colt stocks, even magpul seems to be a crap shoot. I had a commercial CTR that wouldn't "restrict" on any commercial tubes too.
"Life is short, but the years are long." - Robert A. Heinlein
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