When player kills who is shooting, his gunfire sound keep going.
You can see what's going on in the video link down below:
https://www.dropbox.com/s/p80fh30zwepy95x/Insurgency Sandstorm 2019.03.15 - 22.17.37.02.mp4?dl=0
I found the solution is loot dead one's gun. Then sound stop. (This is not in video)
Please fix this bug. This is quite annoying.