I'm about to purchase my first Glock, and have decided on the Gen 3 17. I went to my local sporting goods store this morning to have a look, the only problem is that the gun did not say Gen 3 on it like the gen 4s do. The salesman checked his inventory and the computer had it listed as just a Glock 17. There was also no mention of a gen3 on the box. My question is, does the Glock gen 3 actually say gen 3 somewhere on the gun, or is this an entirely different model that I was looking at?