Then what ?
It seems quite a few on here are always worried about their barrels having pits and the first thing they want to do is have them removed, why, I don't know.
It is almost the same when someone buys a gun that is choked full/full or mod/full and even before they have the gun in their hands, want to have the chokes changed.
Pete, yes, the .410 is out. I had tried one from another company that would only fit into a 12ga. The reach was only about 18" and it would not fit in the muzzle end.
I would think for those worried about pitting, that the darker the area, the deeper the pit.