Anyone else have one of these marks in their barrel? I finally got my rifle complete, took it out to the range and got a few rounds through her. This is the problem child rifle that I'm sure some of you have seen me post before. Gave it a quick cleaning, and got a patch stuck in the bore. I use a otis pull through system and usually double up my patches. They are snug, but I had to really pull that sucker through. Don't think it is a brass mark, no brass could have rubbed it. Cleaned it again to make sure it wasn't brass that rubbed into the surface. Mark follows the helix of the rifling from the chamber to the muzzle. Lemme know what you think. Pics are from an endoscope, and my phone camera. Criterion chrome lined 1/12 twist. Machining mark that got chrome plated?