So I'm transferring my USPc 9mm to my girlfriend. She lives three hours away from me and an hour from her parents house which is the agreed-upon "bug-out location". I've made her a GHB/BOB however she lacks a firearm. She shoots my USPc well so we decided she should have it and I'm going to transfer it to her through FFLs. Well, my USPc is my GHB gun so I need a replacement. I really don't want to add another caliber so I'd like to stick to a .45ACP, non-1911 handgun. I've got a G21 already and was considering another or maybe a SF version. Any reason why I shouldn't get another G21/SF?