Some of the 99's I've shot benefit from putting a bushing/spacer right over the screw that attaches the forend to the barrel (kind of a free float).
Not so much on takedowns, but the solid frame rifles at times have been squirrley. Once the spacer is in place, the stock still moves a bit, but isn't contacting the barrel.
Worth a try, it's easy, and cheap.
I heard you on that. I have an O-ring under the forearm.
BP...
