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Went out today and shot my new 10mm build with a new unmarked barrel off eBay and it's damaging the brass as depicted in the photos. The dent is coming from the right side of the chamber. The gun aIso has a distinctive "catch" when chambering the first round, but it didn't jam and it ran flawlessly otherwise. Same happened with four different mags. I found that the damage was coming from the mouth of the chamber and am wondering if simply polishing a bit at a time will remedy this?
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