Just like Payday 2, PD:TH also have the issue of where you will hear two gun fire sounds when your weapon only fired one bullet. It will not affect actual gameplay but very annoying.
This mod fixed this issue, by force stopping the fire sound loop, and make all weapon fire sound "single shot sound", then the game will play the "single shot sound" once a bullet is fired.
This mod is originally created for weapon rebalance purposes, in order to customize each weapon's fire rate, but you can also make it a vanilla enhancement mod.