I bought a G17 slide from Glock in Georgia to convert a G17L to a G17, but I'm pretty sure that pre-iTAR days...
By the way, if you put enough rounds thru a Glock the slide can fracture. Wayne Novak correctly calls them
"glass-hard". Since most users will never experience this issue Glock is reluctant to change the surface treatment
which has so many other great advantages.U
It's only competitive shooters and spec-op "operators" who will put enough rounds thru one to discover this.
I've had Glock in Georgia replace two slides for myself and one for a friend under secret extended warranty.
The signature of a cracked slide is that the POA/POI relationship suddenly changes windage by say 8 inches at 20 yards.
The crack forms at the back/rear of the ejection port, extending downwards to the bottom edge of the slide.
(thinnest part of the slide under the highest stress).
ITAR has an exemption for warranty replacement parts.