I've got a friend selling a 1st Gen G-17 (s/n AR5xx, smooth grips, no rail), and I'm trying to find some info on it. In (2000) we were shooting a match together, and a fellow shooter who was a Glock Armorer noticed the G-17 was a 1st Gen, and wanted to check for a factory recall/mod in the trigger area that needed to be done. It wasn't then, but the fellow shooter performed it, swapping a few parts in the process. I realize that's not much to go on, but any idea what that mod might have been? Second, he's going to put the gun out on GB, but has no idea of a reasonable reserve to put on the auction. Do early 1st Gen guns command any kind of premium, or do they just move the same as any "used Glock 17's?" (Note: this is not a solicitation to sell the gun. I'm just looking for value. Please don't PM me with an offer.) Thanks for the help.