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Thanks magicglock, I appreciate the information. That's about what I figured, but thought I'd ask anyway.

magicglock wrote:Sorry, you can only step down .40 to 9mm. You cannot go 9mm to .40. The ejector is different on the two models and will only allow G22 to 9mm, G23 to 9mm, or g27 to 9mm.

Kind of what I expected. What about a G23 slide, plus barrel and spring/guide rod? Is such a thing even available? I know you can get .22lr slide assemblies, but would a G23 slide work on a G17 frame?

Not to hijack, but on a similar note, I just traded for a G19. I know it's safe to step down from .40 to 9mm, but what about swapping in a barrel and spring to go from 9mm to .40 cal? Can it be done? I've always liked the .40 cal for carry, but 9mm is cheaper and (slightly) easier to come by these days, plus the deal I got for the gun was too sweet to pass up.