If tomcam is right that these are actually Chinese secret police. If so, and you're some random person with a gun, reaching for it might be a very bad idea. (Even if the Chinese secret policeman doesn't have a gun, it could still be a very bad idea.)
This just highlights the absurdity of the situation. The real Chinese police would know that attempting to operate this way is just going to get them shot.
100% this is a case of dumb kids decorating their cars.
Being shot on US soil by a Chinese policeman operating as one would constitute an act of war.