I have just purchased a Uberti-imported 1873 20" short sporting rifle and the case hardened-colored receiver is very attractive. My question: Does Uberti do this with a true case hardening process (called carburizing, I believe), that is, with a hot charcoal/bone dust (or something like that) fire that deprives the surface of the metal of oxygen and results in surface-hardened and stronger steel as well as the nice rainbow of surface colors after being quenched in water? The reason I ask is that over at the SASS forum (as I recall), someone has authoritatively stated that nowadays case coloring is a marketing tool and just a "fancy dye job" to the metal surface and is not done like the old heating/quenching process at all. How does Uberti do it? Anybody know? Is it durable, since old-style case colors tend to go away, right? Inquiring minds want to know...Thanks.