[dgludwig]

For what it's worth, all of the match configured ARs that I've seen have had s/s barrels. The RRA National Match rifle that I compete with in service rifle matches has a s/s barrel and is more accurate than I can take full advantage of. That said, I have never seen a report testing chrome-lined barrel vs s/s ones, everything else being equal, to affirm that s/s barrels are intrinsically more accurate. If there has been such a comparison (surely there must have been at least one, you'd think), I'd like to see it (them).