What does doing that thing from the movies to a shotgun accomplish?

sorry if nomenclature is wrong. but do you know that thing from the movies? one person is pointing what i assume is called a shotgun to another person. then the person being threatened says something that pisses off the other person, and the person holding the gun does the thing where they push a part of the gun... show more sorry if nomenclature is wrong. but do you know that thing from the movies? one person is pointing what i assume is called a shotgun to another person. then the person being threatened says something that pisses off the other person, and the person holding the gun does the thing where they push a part of the gun forward and then back, making a sequence of intimidating sounds. but i mean, the person was already presumably pointing a gun that was ready to fire before. i assume the manufacturer didn't just include that feature for intimidation, so what is it for?
14 answers 14