Why not just use the carbon fiber liner stiffener?One thing that we use to do to our rifles when I played airsoft. The barrels on many of the "sniper rifles" are built the same way as the FX barrel system is made. I would remove the inner barrel and apply some electrical tape as tight as I could. Then put the inner barrel back into the outer barrel and then make a plug to center the barrel with the outer barrel. Melt some wax and slowly pour it between the two barrels. Once hardened it would secure the inner barrel and there would be no vibrations or movement.
Have considered doing something similar with the FX barrels. Though I would wax the inner barrel to aid in removal of the liner, and use a slow curing epoxy instead of the wax. This should make a much more solid connection as well as helping with centering the liner. Could easily be done in stages as well to make sure there are no air bubbles and that the liner is centered. Could be a cheap and easy way to make a custom liner if you are unable to find a carbon sleeve.
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