Picked up a shotgun for a pretty decent price but the rib makes me a bit suspicious. I can see a light brown material along the joints running down each side of the rib where the rib meets the barrels. There was also an area where it looked as though the material oozed up. It was hard but I was able to scratch it off with a fingernail. A toothpick also was used to scratch it out. Common sense makes me think there is no way it can be epoxy as it would be hard as a rock. Tapping on the barrels produces a nice ring. Bluing is fine under the mystery material. You probably cant tell much by the photos but I have included a couple anyway. You can see where I scraped some of the material out. Any advise/thoughts would be appreciated.