concerned no. should it be there? no as well
What is it?
I won't worry. It is a 416 SS should even if the finish is off, it is not going to rust instantly.
It could also be an aluminum rub mark if they use an aluminium barrel fixture, like the military does.
If you actually shoot your DD MK12 it will get more spots and wear, so best mentally prepare for that now, if that small blemish alarms you.



























