There is a bug causing most if not all of the fully automatic weapons (including mounted machine guns) in the game to use the same incorrect audio file, I think it is the A2000's audio. Is this likely to be fixed? And are you aware of it?
From what I can tell it is 100% consistent, I haven't seen a single piece of footage from the PS4 version of the game where this bug isn't present. It is not present in the Xbox One version however.
Hey Greig91, thanks for reporting! These steps may help with this issue.