Parkerizing soaks up liquid really well, and new bolt carriers will generally have a pretty aggressive parkerizing that will wear down with use.
FC seems to do a very good job even with a thin coat.
Please remember that when I say that I re-lube prior to shooting, I am talking about a drop or two on the bolt, and one on each "rail" of the BCG, and that the guns are being prepped to fire several hundreds of rounds while suppressed from 7.62 and 5.56 and I will not have the opportunity to check on them for hours at a time.
As far as not functioning if in immediate need: ARs can generally make it to 300+ with no lubricant at all. This is not due to friction or heat, but from fouling accumulation in conjunction with the above.
It does, however, raise an interesting question, so the next time I am at the range and have a few hundred rounds to waste (which is becoming less and less frequent), I'll wipe the operating parts "dry" (not degrease, just leave the film of FC on the parts) and see how long I can go before I get a fouling related stoppage.
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