It's slightly concerning yes. I wanted a pampered retreat. Valentine's isn't roses and chocolate anymore.
Sniper rifles aren't really used for spree killings. They take too long to reload in most cases, and they're not what you would really use for hunting game.
That said, if you are in Vegas and they are also in Vegas, we live in a country where it is legal to have certain types of firearms. And others if they are altered to make them legal.