Went out and shot 5 rounds of wolf out of the new SKS. At 30yds free hand I shot a very nice group, only took about 2 seconds between shots.

When I took the gun home I gave the barrel a good scrubbing, inspecting the bore I notice 3-4" in the is a gouge/scratch from 11:00-1:00 in the bore. Looking straight in the barrel you cannot notice it but if you look from the 6:00 position you can notice it. There does not appear to be any budges in the outer part of the barrel. I did not notice this before but like I said you can not see it look straight into the barrel.
What could cause this and is this something I should be concerned with?