This is another one of my test sound packs works for both for SP and Fivem.
This sound mod is for the following guns.
Pistol
pistol mk2
combat pistol
pistol50
heavy pistol
vintage pistol
ceramic pistol
This is just a few of the guns.
How to install
C:\Program Files (x86)\Steam\steam Apps\common\Grand Theft Auto V\x64\audio\sfx
Drag drop both of the RPF files in sfx and replace and done.
Credits:
El chino