One of the things Michael Mann did / does which is revolutionary, but which should really be kind of obvious, is record & use the live sounds of the actual gunfire you are seeing onscreen, & use that as his final product, rather than dub it in with sound effects like literally just about every other movie & TV show. The result of that is the visceral realism that punches you in the gut when a gun is fired in one of his films. Canned sound effects, which again just about everyone else uses, feel safe, clean, slightly unreal, like a video game. Mann’s genius here is just in the simplicity of preserving the guttural realness of actual gunfire sounds.