What he said. Tenifer is not a finish or a coating, it's a surface hardening treatment. Not at all unlike case hardening. Different process, same result, only harder.It's just a high quality steel with a proprietary hardening process Glock refers to as Tenifer. Think of it as a high tech case hardening process. The portion which is effected is an extreemly thin skin, a Google on Glock Tenifer will yeild better results than I am giving here though. The tenifer is under the black coating and is actually in the steel. The black stuff is an added protectant but is mainly cosmetic.