Hi James, The Glock 17 gen 4's are manufactured in the US now in Smyrna, GA. All of them are made in Austria but US guns have Smyrna, GA stamped on them due to some ATF laws, (Importer). Glock gets kicked a lot by the ATF, that plastic gun that you can sneek though a metal detector you know. They are in some sort of tift right now.
Glock is not the only manufacturer required to put the importer stamp on guns brought into the US.

it seems like its listed both ways I would I would check this with Buds via LiveChat (available from 9AM to 9PM 7 days a week), the "Blue Chat Now" bottom at the bottom right of the page at 9 CST or phoning at (859) 368-0371 (available 9AM to 9PM EST Monday through Friday). and if they can not answer I would contact Glock and ask them Phone:
770-432-1202
FAX:
770-433-8719
U.S. Headquarters
GLOCK, Inc.
6000 Highlands Parkway
Smyrna, GA 30082
USA
Phone:
770-432-1202

James, from what I can tell by the markings from other sites it's made in Austria. However, I would verify this with Buds via LiveChat (available from 9AM to 9PM 7 days a week), the "Blue Chat Now" bottom at the bottom right of the page at 9 CST or phoning at (859) 368-0371 (available 9AM to 9PM EST Monday through Friday). Information I used came from this article : http://smallarmssolutions.com/home/glock-austria-vs-glock-usa-made-pistols