I bought a used SR9c recently, but didn’t notice the blemishes on one end of the barrel. They appear to be impact burrs but I’m not sure. There’s no corresponding damage visible on the slide. Pictures in the link: https://imgur.com/gallery/5JUrs I’ve run 180 rounds through it with 2 misfires which I attribute to some cheap practice ammo I bought. Accuracy is varied but that could be me. Has anybody seen this before? Should I be worried about it?