FWIW, as I lurk over at AR15.com, the consensus seems to be that chrome plating adds to barrel life, but reduces accuracy.
I don't understand why it would reduce accuracy...is it because the plating results in a barrel that has an uneven dimension to the bore?
Anyway, those that prefer accuracy want "plain" barrels, and say that the extra life of chrome plating won't be noticeable in the shooters lifetime. Those that want durability, and want to shoot frequently, with "good enough" accuracy, want the chrome lining.
This is all third hand, so grain of salt, etc.
And if anyone can comment on chrome lining vs. accuracy, I'd appreciate it. Wish Gale McMillan were still with us.