I've always had the desire to own two of the very same firearm... mostly in the case of a handgun. Does this make any sense? Backup perhaps, kept in different locations? Convenient for when my boy and I shoot together? Topping the list would be the Glock 19 or a 22 semi auto pistol. Other scenarios are that they are not identical. For example, one Glock 19 with traditional iron sights and another setup with an optic.