Since the scope was still out and I’d never looked inside the AR-10 barrel:
Clearly some carbon fouling down next to the lands and a bit of copper on them.
Ramps to the lands are dirty but not much in the way of erosion.
Lots of carbon at the mouth and inside the chamber. Not surprising with a direct impingement gas system.
Gas port is clear, maybe a little wear or buildup on the left.
Time for some Wipe-Out!
KatNap Fever! 
Now I am motivated to clean my rifles when I get back!
WipeOut is indeed an amazing cleaning product! It even got my M1 Garand barrel mostly clean, although it still shows a bit of copper fouling.
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Good stuff, but see my later post. Living and learning again.
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