Pardon, but what is a 7 digit barrel?
As you gain experience as a collector, you will learn what all of these things are. Its all pretty confusing for anyone new to this stuff. You will get there
I think he meant to say:
Meaning that the gun's SN was in the millions AND it had a NM barrel. This is just my speculation on his post.
On second thought, I think I misread his post. Now I have the same question!