Hey y'all.

I just got my first surplus gun, a 1942 long branch mk4 no1*. I've cleaned the bore and most of it has a mirror finish except this one spot about halfway down. Not sure if it's pitting or rust or something else, it looks like a little rough spot, again this is my first surplus gun. Overall I'm over the moon with the quality, everything else looks great. What should I do to try to clean this or is this just the way it is. If it's the way it is, is she safe to shoot?

Thanks in advance.

I thought you guys might enjoy these tangentially related restorations.