Kydex is extremely hard on metal surface finishes - probably because instead of the bearing surface being essentially the entirety of the exterior of the handgun, it's typically only a few high points that the kydex "grabs" in and out and these surfaces bear the brunt of the finish erosion. You see the same thing with knife holsters/scabbards. I personally wouldn't use a kydex holster with anything but a stainless pistol or revolver, but YMMV.
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