Ray Gun Inspiration: "The Atomic Auditor"

If I had my way, I'd commission an entire armory filled with these babies to be the model for the "Atomic Auditor" carried by every Space Ranger. 

Here's a small selection of what I'd consider to be "variations on a theme", namely snub nosed, silvery, and wide barreled or flared at the end. Many of them are custom props--the one above is a 3D render by Deviant Artist Polperdelmar and among my very favorites.