black ring forming in barrel

I think I solved the problem....is it possible that I am looking at the back-boring of the barrel? Today I looked down my friends bbl of his SKB(I think?) o/u and in both barrels he had what appeared to be the same rings as what I am seeing in the barrel of my M1. He told me that it was the back-boring. If that is the case, I have been trying to clean out something that is now probably a lot more clean than it ever needed to be. WOW...that's embarassing. It would explain why I never saw anything like that in the bbl of my 870 Express. Any thoughts?
 
Well that was kinda one of my first thoughts. I couldn't figure out how you could not get ANY crud out of a barrel with all the work you put into it. Actually I thought you were looking at the forcing cone though.. Sure glad you figured it out and can now just clean the barrel as needed :D
 
Thank you for all the advice. I agree with you. I couldn't believe that there was any kind of residue that wouldn't come clean after the torcher I put it through. I learn something new everyday. I definitely won't be making that mistake again. Thanks again all.
 
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