Speaking of the MA5K, Bungie should put that into the game, or that epic combination of the Ar and the Br, or an Ar that can switch the burst so that it is not always on auto, oh and a Red Dot Sight where the ammo counter is?
They'd probably just thing it's a water bottle.
And that's why the AR wins. It looks enough like a gun to be called a gun, but enough like a Sci-Fi gun that people will know it's a prop. Perfect for public.