Behind the scenes: How gunfight scenes are done in British films and TV, using model guns that weigh nothing more than paperweights, yet they look very realistic and are controlled remotely to create gunfire effects. Many other 'tricks' are also used to create realism. Very clever!
That said, I've used real ones on set, with real gunpowder.
Yeah? So? The point of this video is that there is no need to use real ones in film (movie) making. The goal is to achive realism, i.e. the quality of representing something in a way that is accurate and true to life.