I agree with all the members that say "shoot it"! bore descriptions are subjective and if the gun is being represented as a shooter, then practical accuracy is all that matters, not how it looks to any inspection.
My MP40 has a dark, speckled bore from the use of cheap, Eastern Block corrosive blanks fired at demonstrations and reenactments.
I can still take that gun and fire single shots dead on at clay disks at 100yards and break 9 out of 10.
Bore frost is unimportant if the gun shoots.
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