Tell me what this means.

[King Medallion]

I'm following this on gunbroker, and I'd like your opinion on this bore. What is the ring mean?




I see the bore is rough, maybe too rough, maybe would shoot just fine. Never know till one shoots it. The rest of the gun looks great to me.
https://www.gunbroker.com/item/1075080777

[Buck Stinson]

Can't see the outside of the barrel surface, but from the inside, it looks like a bulge.  If it is a bulge, you should be able to see a slight bump on the outside of the barrel.  Particularly easy to see on round barrels, such as this.  If this is the case, it was probably caused by an obstruction closed to the muzzle end of the barrel.