I didn't bother worrying about a gun, but as always I had a knife with me. I handed out candy, as a vampire. I look the part, long black hair, facial hair, and had some neat fangs. Parents looked at me funny, I looked at the parents who were acting weird, and the attractive young mothers got a few more looks from me. Can't help it, it's nature.
No armed trick or treaters, but this IS Southern California, in a gated community. We don't expect that stuff. In Oregon, I don't get trick or treaters. Maybe I should consider this more next year...