During WWII, Hollywood churned out so many war-story films that it ran into a problem. Prop masters couldn't lay their hands on enough Lugers to go around. So, they innovated, creating an oversized Luger-like shell to go over a Colt .38 revolver. NRA Museums senior curator Phil Schreier shows John Popp one such "frankengun." The cover flips out to allow blanks to be loaded. Plus, you could toss it around during production without worrying about damaging it. It's another firearm from the newly-refreshed "Hollywood Guns" exhibit at the NRA National Firearms Museum in Fairfax, Virginia.