I have magnets for my car; American flags, 'Don't Tread on Me", etc. (I wanted to get a Molon Labe/μολὼν λαβέ magnet, but my partner said no.)

It's camouflage because I live in a deep red area.

I would put gun stickers on the car--god knows I have enough--but a 'Glock perfection' sticker = free gun in glove box, and is asking for a break-in while you're in the Piggly Wiggly.