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So I took my new XD9sc to the range and put about 200 rounds through it today. Came home to clean it and found this:
It looks like it's chipped around the very end of the barrel, but I can't imagine how. The "chips" are where the recessed portions of the rifling meet the end. That makes me think it's some kind of buildup. I guess I could just use the bronze brush on it and find out, but I wanted to ask first if anyone has seen this. I never have, not even on any of my XDs.
Ideas?

It looks like it's chipped around the very end of the barrel, but I can't imagine how. The "chips" are where the recessed portions of the rifling meet the end. That makes me think it's some kind of buildup. I guess I could just use the bronze brush on it and find out, but I wanted to ask first if anyone has seen this. I never have, not even on any of my XDs.
Ideas?