M&P Barrel Damage?? **UPDATED PICTURES** So I took my new S&W M&P compact 9mm shooting for the first time this weekend, only putting 150 rounds through it. It shot pretty well, but I'm still getting used to the trigger, and shorter sight radius. So I get home and take the gun apart for cleaning, and notice that muzzle looks a little strange. A closer look reveals what appears to be some small burrs where the rifling meets the muzzle. I'm not sure what would cause this, if its normal, or if it will go away. Kind of irks me since its a brand new gun, but maybe I just don't know what I'm talking about here. I've attached a photo (I know the quality sucks, I'll take a better one if necessary) see if you can kind of see what I'm talking about.