They don't use stainless barrels. That's a Raw Carbon Steel barrel. Buy a stainless one...
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Is that rust or a heat mark from being run hard?
Lots of makers use carbon steel for barrels and many match grade barrels come in carbon steel. The rust is more of a cosmetic issue; I know it's hard to swallow after dropping 1K or more dollars on a gun. You could see if Kimber would replace it but guess what; it's likely to be another carbon steel one.
I'd call it a day but if it bugs you, the best bet is to lightly bead blast it. I'd be careful sanding/polishing where the bushing locks up as if the diameter is reduced it will affect accuracy.
What oil you using?
A good oil should have prevented that. I use CLP/Breakfree or occasionally RIG grease. A heavy grease would do best to prevent this too. For greasing the barrels I use two fingers and apply a very light coat of grease to some pistol barrels.
PS...
That is one reason why I HATE MIMbers
another anti-mim elitist i see..........
No don't like POS guns...
For a 1K gun it shouldn't have the fit and finish of a PT1911. JMO
OR Colt or S&W or STI or SIG or SA...Agreed. Dan Wessons are in the same price range and are way better quality.