The gun looks odd though. It looks like a film prop, it has no chambers, so I don't think it can take bullets - but I could be wrong. A weird profile though, I quite like the look of her though.
I don't doubt it's a prop I would never risk handing a loaded gun to some of the models I've worked with.
People have weird fetishes, when I worked for a glamour studio we had a regular client that would select a model from our agency, send an item of clothing usually a jumper or cardigan along with some specially folded handkerchiefs. We would have to video the model stuffing the handkerchiefs up her sleeves until she couldn't fit anymore. The rule was she mustn't laugh or giggle. Amazing what lengths some go to for kicks.
Girls filmed with snakes, tarantulas and even butterflies where regular requests that we fulfilled.