Some Manhunt weapons with sound included.
just put the Modloader folder in your GTA III directory, and use MagicTXD to replace the icons of your choice.

the mod incluides:

-Nailgun (replace pistol)
-Assault Rifle (replace M16)
-Sub-machine gun (replace uzi)
-Nailbat (replace bat)
-Shotgun (replace shotgun)
-Bottle (replace molotov)
-Sniper Rifle (replace sniper rifle)
-Weapons icons (PC/PS2/MOBILE)
-Pills (replace health pickup)
-Sounds from Manhunt weapons.
-Extra.

You will need Gta3-vc Audio Editor to replace the audio files.

MagicTXD: https://www.gtagarage.com/mods/show.php?id=27862
GTA3-VC Audio Editor: https://www.thegtaplace.com/downloads/f82-gta-audio-editor