If it were mine I wouldn't be especially concerned about it. I had a Ruger Red Label that had a mildly defective seam where the barrels were sleeved to the breech block and the weld wasn't complete... not that you could actually see the fault, but whenever I shot the gun a small amount of oil (from the previous cleaning) would seep from the pressure of the discharge of the shell, through the seam. Ruger actually told me it was nothing to worry about and refused to replace my barrels.
When I magnify your picture I can see several other such "inclusions" and I really wouldn't worry. It has lived this long without 'unwinding' and it will most certainly live longer than any of us (if reasonable care is used in the shells you shoot).
Just my 'humble opinion'.
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