Firearm usage in the movies date way back to the Silent Era. They have been shown in such genres as gangster, western, war, cop and other movies.
Most often the portrayals are inaccurate and some firearms weren't even invented until after the eras portrayed.
Liberty Safe has an article on the "Top 10 Annoying Hollywood Gun Mistakes In Movies".
They start it with:
Since the earliest days of Hollywood, audiences have been fascinated with the portrayal of guns in movies. You can hardly find a classic action movie poster without the hero holding a gun. Trailers will have lots of choreographed gunplay, bright muzzle flashes, and over-the-top muzzle blast added by the sound editor.
Despite the typically poor gun handling skills by actors (fingers always on the trigger, pointing or gesturing at innocent people with their handguns, muzzling everyone), this is typically only noticed by people who actually own and shoot guns. And despite a seemingly never-ending supply of bad/incorrect/annoying gun mistakes in movies, it doesn’t really seem to impact the success or failure of the film at all. The majority of viewers are ignorant of how firearms actually work, and those who understand the mechanics are usually able to suspend their disbelief and just enjoy the movie.
However, sometimes it gets to the point that firearms enthusiasts, or any other viewers who appreciate a dose of realism in film portrayals of firearm use, will get so annoyed by the Hollywood gun errors that it can impact their viewing experience. Here are some of our top picks for annoying firearms mistakes in Hollywood movies.
To read more, go here.