OldVet it isn't that it is confusing to own multiple calibers or anything difficult. At the moment I own handguns chambered for 6 calibers and don't have any issues. However when you're looking at guns to be used primarily as defensive weapons and you're not someone with a large collection, there are huge advantages to picking same caliber guns, particularly with the Glock platform. Being able to stock one caliber lets you get a reasonable amount of ammo more easily. Being able to use the same magazines means less investment is required to have two guns that are able to be used in bad situations. Making your first two handguns the compact and subcompact Glocks of the same caliber is a great idea. I wish I'd have done that instead of waiting so long to make it work for me.