Well, when Shiherlis doesn't reload until he spits out about 100 rounds, that is a little off, but keep in mind, practically NO films had used realistic gun fire that was loud and echoed (or didn't indoors, another important thing). Also note, people hardly hit anything during the bank shootout, as opposed to action movies where a guy with two guns flies around blowing away everyone he sees.
If I ever make a movie (doubtful though), my first mission would be to accomplish the most realistic gun film ever, with Heat as inspiration.
Never ask too much from movies gun-wise, you'll always be disapointed.
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