I just buzzed past
www.glock.com the US version.
The specs & data no longer list tennifer as the surface treatment on Glock models(sold in the US area).
Tennifer is
not listed anywhere on the US website.
I guess if you have a older format Glock you're a lucky dog,
.
I never owned any G-locks so I can't say or compare any models.
Id still buy a NIB model 22 or 23 Gen04 & do some tinkering.