My biggest beefs are racking the slide on a pistol multiple times. I believe I was watching US Marshalls the other day, where Wesley Snipes' character does this.
There were also several technical issues I had when watching this movie, especially when the lesser Marshalls clear rooms by entering with pistol extended forward in front while coming around a corner.
There's also the finger always on the trigger issue. This is the classic mistake in nearly every shooting movie ever made.
In The A-Team, I recall a scene where Hannibal shoots the hat off of a bad guy with an AK... from the hip, never mind that it was done with 3 rounds in full auto.
Then there's The Matrix movies, where the Agents easily conceal Desert Eagles in their government suits. They also shoot multiple holes clean through Neo in the final scene, evidenced by the blood spatter on the wall behind him. What's missing is the .50 cal holes that should be there as well. That, and that healed-up Neo immediately after seems to have something more along the lines of 9mm healed holes in his chest. Switch also enters battle situations with her Hi-Power uncocked.
The worst yet gun handling I've seen, was scarily enough not in a movie, but on Cops. This was an episode shot in El Paso, and the first section of the show involved a drug bust operation. They entered a residence with a no-knock warrant when it certainly appeared that it was unnecessary to do so. They knew where the drugs were - a van in a closed off garage area, and the person responsible for them was known not to be there. The van was loaded with what looked like several hundred pounds of pot, and that certainly wasn't going to get destroyed in the few seconds it took to announce themselves. They busted in wearing black ski masks on to a middle-aged man and woman who offered absolutely no resistance. The officers entered with guns drawn and moving around, covering the officers around them with apparently no plan of action in regard to positioning or systematic clearing of rooms. It was like a herd of guys with poor gun handling skills meandering in multiple directions, gun barrels sweeping each other. The best of the bunch held his gun near his head pointing at an upward angle, as was popular in posters of shoot-em-up films in the 80s. See this image for what I mean:
I haven't critically analyzed the gun handling in that many films yet, but it seems to me that Tommy Lee Jones certainly knows his way around a pistol. At least one Texas boy in Hollywood to make us proud.
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