This is a really cool "bang bang handle" aka a gun door knob designed by Nikita Kovalev. I am curious how the door knob actually works.
But I think it would be totally cool if the person doesn't open the door knob, you can shoot the person with water or something from your end (but I highly doubt that is the case but it would be fun, lol)
Would you change your regular door knobs to a gun? It wouldn't match my decor but its sort of fun! Police stations should have this. But I can see why this isn't a popular door knob cause it can influence people to do stupid things.