This mod changes the sounds for most of the weapons in Doom3: BFG, Chaingun, Grenades, Machinegun, Pistol, Plasma Rifle, Rocket Launcher and Shotgun.
The mod file "zpak_rny_weap_sound_+_pulse.pk4" is packed into the .zip archive. Extract the .pk4 from the archive and place it in your Doom3 "base" directory.
To uninstall it, just delete "zpak_rny_weap_sound_+_pulse.pk4"
The M41A1 Pulse Rifle sound for the machinegun were made by @Sharp (IA-Studios, http://www.irishacts.com) and published under the Attribution 3.0 license. I just made and edited the sound snippets for the shots from this source.