I noticed the other day while playing Helmand that the AK sounds like its shooting at around 400 rpm, but it actually shoots (ingame) at around 600 or 700.
I know there is a way to fix this but it takes a little work
there was a guy that did it in 2142- most of the weapon sounds in that game are way off, and he fixed them (mostly)
i think the vid is called 2142 gun sounds on youtube.

