Agree with not shooting it till ring is removed.
Quote:
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i was told that it my be dried preservative from the factory, where it was fired and the grease seized to the metal
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If that is the case and you cannot remove it with normal gun cleaning products and a brush, wrap a rag around a worn brush and run in down just past the ring, spray carburetor cleaner down the bore. Enough to soak the rag. Pull the brush/rag back so it covers the ring and let soak for 10-15mins. Spray some more cleaner down bore and scrub.
This should remove the ring if it's some kind of dried lube/preservative.
Just don't get the cleaner on any wood or plastic. Also make sure and lube bbl well when done.