Austrian made Glocks will have "Austria" on the left side of the slide along with the caliber and model number, USA made Glocks will have "USA" on the left side with the same info,
USA made glocks also have a tiny pentagon stamped into the barrel and what I think is the state of pennslvania on the right side of the slide and frame, not sure about Austrian only have 1 so far
To pazzo : No I bought the gun from a dealer in BC they had a picture of an Austrian made glock 17 gen 3 that's what I assumed I would get, when I got it home and unboxed it, it was a USA made glock 17 gen 3. and it does have the MADE IN USA on the left side of the frame along with Glock, INC., SMYRNA. GA.