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it is not mentioned on their website "Barrel: 16″ (406.4mm) Superlight with Melonite QPQ Finish and A2 Flash Suppressor Barrel Material: 4150 Chrome Moly Vanadium 11595E Steel with M4 Feed Ramps" so I suggest you contact them to get a 100% accurate answer Contact Us Toll Free 855-808-1888
It does not that I could find, but honestly Chrome lined barrel on a 556 is really wasted money, ot increases longevity bit most civilian will never even come close to shooting out a non chrome lined AR15 barrel. Chrome lining also decreases accuracy, and raises prices, for little to no gain.
It's not listed on their website so I'd imagine it's not chrome lined. I'd contact them at 855-808-1888 or 207-893-1634. Sorry couldn't give a definite answer but hope this helps.
Evan, the Super Light model is one of the few non chrome lined barrel models that Windham offers. Cheers and stay safe!