Rusty, I have a Birchwood Casey bluing pen that works pretty well. I could just use a regular stamp and then dab it with that. Just figured I'd see if someone else had a better idea.

If I was the only person who would ever shoot the rifle, I wouldn't bother. But giving it to my son and the idea that he may loan it to a friend or whatever... it's an accident waiting to happen without any kind of barrel stamp.