I think I get a little paranoid on Halloween. It seems to me that's when all the weirdos come out so they don't have to hide it. Needless to say I had one on my hip (CC) and the 12 Ga on ready behind the door.
Anywhoo... I do not think using a real gun as part of a costume is a good idea. When I was a kid I had a costume one year that needed a gun. I just used my Dad's western style leather holster and belt. Realism takes a back seat to safety when it comes to costumes I feel.