Hi,
I've been trying many different bore solvent on a used rifle and have some discoloration at the muzzle. I'm assuming that maybe it will be that way and I have to accept it, or maybe it can be corrected.

Without a bore scope, it's really difficult to see the left over, burnt carbon from neglect of previous owners. What will work, as per my decription, and I hope someone else has experienced this too, to remove neglect?