Originally Posted by Arc Angel
Wow. You take fabulous pictures! Those are tough photos to produce; and you've got them clear as glass.
Rustypigeon has given you good advice. In addition to the phosphor-bronze brush, I'd suggest you use a cleaner like Break-Free CLP; and let it sit in the barrel overnight before you start brushing. (You can, also, use Flitz Metal Polish and start brushing immediately without waiting.)
I think your bore will clean up fine; as for the barrel bushing in the slide? I don't know; but you have mentioned that it's got, 'depth' to it. That groove shouldn't be there; but, if this is the case, it's really not going to adversely affect the pistol's performance.
Thank you, I'll do that tonight with some CLP and let it sit overnight.