I don't know which part is the HE or not, but the black is holding up very well to holster wear. I don't know how many thousands of presentations mine has seen, but there is no sign of burnishing of the surfaces and edges on my slide or frame. The black finish on my HK is worn in one spot (unrelated to holster wear), but it does not show, nor has it ever shown, any corrosion. As a matter of fact, it is as shiny as my stainless Beretta, which wouldn't be the case with bare steel. This leads me to believe that the HK, like the GLOCK, is finished underneath and then coated with black.