Those are real echoes in the movie. Michael Mann prefers the real stuff over dubbing later because it's so rare in film, it causes the audience to really feel it.
He did the same thing in Collateral, when Tom Cruise takes on the tweakers in the alley. (btw, Cruise really did that, it wasn't CGI or a stunt double. He drew and fired 5 (blank) rounds in less than 2 seconds.)
Thanks! It was definitely more immersive to see real guns with real weight, cycling, casings being ejected, etc than the Hollywood norm of plastic props and adding everything in post.
Normies may not know the difference, but if you shoot regularely the completely echoless gunshots, lack of recoil, and lack of metallic shine on wear points looks wrong.
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