A very minor custom I did as a gift for a friend who was annoyed that the Mulder Funko figure had a gun and Scully only had a flashlight (and probably a good way to start with customizing, considering how simple this was). The gun was from a big stash of Star Wars figures and accessories an acquaintance gave me a few years ago, and originally it was too long to look like a normal handgun because it was supposed to be a Star Wars rifle. I cut off about half the barrel and a protrusion on the side, colored over the exposed white plastic with a permanent marker, and super-glued it to Scully's hand. So, REALLY simple.