[Jaywalker]

"Tenifer" and "Melonite" are trademark terms for "ferretic nitrocarburizing," as is "Tuftride," which is the same as "Tenifer" in countries where the company (Degussa of Germany) couldn't get a trademark for the word "Tenifer." I understand Glock is no longer using it, but whether it was 2010 or some other time, I don't know. (For instance, there could have been left over slides, or slides from a country that has different environmental regs from that of the US or Germany, or essentially the same process with different salts used.)

I did see an email in a forum purportedly from Glock technical services stating that Glock was now using "gas nitriding" as a surface treatment. So, at the very least, Glock did not stop the Tenifer process and start with the same ferretic nitrocarburizing, but they might have chosen different salts. I imagine there are multiple surface hardening processes to choose from, so they may change at any time.

Edited to clarify the differences among some of the processes.