I've been looking around and couldn't find a sound mod that I like, so I made one here
Using sound sourced from many modern game like CS, Apex, FO4, etc...replacing almost every weapon sound from reload to fire, distant fire, echo and explosions.

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To install open Resident.RPF in GTA4/pc/audio/sfx/ with OpenIV, click edit mode and replace the two file EXPLOSIONS and WEAPONS from the downloaded archive