there is a rust kill product that looks like PVA glue...it converts rust....stops it growing...DO NOT worry about this too much...just make sure to take suppressor off and clean between uses and store barrel bare.....mate has same/similar rifle wiht full over barrel and it is way worse ,but as others have said,its outside the bore so cosmetic.....to put it another way,if you never unscrewed suppressor to look you would not know...and minute of tennis ball at 150 yards is a good group for hunting rifle.dont sweat it...just treat it and keep it oiled...job done.
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