One aspect that interested me beyond the external protection of the outside of the barrel was the protection of the interior of the barrel - the rifling. Sully claims (and I don't have reason to not believe him, but can't verify) that the treatment will extend the rifling life of the barrel.
I know a couple of AR manufacturers melonite the interior of the barrel, rather than chrome lining it. It is apparently being well received.
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.
no guns = might makes right