Hello everyone I just picked up a Gen 3 G17 at a show today it has the factory adjustable sites on it. but here is my question I tried to look on the forum buy could not find info. the serial # is a fav-xxx-us number. my question is is this a regular number or some special edition I have found no info about this. sorry if this is a dumb question but was just wondering since I could not find anything about 8 digit serial numbers trying to date this.