The chrome lining inside the bolt carrier is not the same thing as decorative chrome as used on the outside of some cheap guns.
The chrome used in the carrier is industrial HARD chrome. This is bonded directly to the steel and won't chip, crack, or flake off like standard chrome or nickel. This is the same type of process used to hard chrome line barrels.
I suspect you won't see whatever LWRC is using used inside a rifle bore.
Personally, from what I know about plating technology, unless they're using some new technology, the hard chrome is the best.
The military issue rifles use the original hard chrome, and if there was a real advantage, they'd be specifying whatever LWRC is using.