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7/19/2005 11:58:52 AM EDT
I received my Polish underfolder kit was really pleased.  98% finish, all matching except bayonet,  and perfect wood.

When I cleaned the bore, it looked perfect at first glance.  I then noticed a dark 1mm wide ring in the bore, about 3mm past the start of the rifling from the chamber end.  I "felt" it with a dental pick and confirmed that it was indeed a sunken ring that had filled with carbon.

What might have caused it?  

I have seen "bulged" barrels before from firing with an obstruction, but never something like this.
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