Well, HEF owns the trademark "Tenifer" and "Melonite" and this is what they say:
"“Dear remat457-
Tenifer® is a name used most often in other parts of the world; Melonite® is exclusive to North America . However, they are the same. Please let us know if we can help you further.
Michael *****
Manager, Sales & Service
HEF USA”
I think that the confusion is in the fact that it is a metal treatment (hardening). The finish on top is different. From experience, S&W's M&P finish doesn't seem to be as rugged as Glock's, however, unlike Glock's it can be touched up with a blueing pen. Also note that Glock has changed the finish/color/formula several times. The Gen4's look different too.
"Nitron" is a polymer coating. I had good luck with it on my SP2009. Seemed to be more scratch resistant than my M&P's. Unfortunately, I didn't have the pistol long enough to evaluate it's long term durability.
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