This is a deadly weapon modification for GTA 3/Vice City.
As you've already guessed, it makes your weapons deadly, so be careful next time you want to fight, okay?
Bonus features:
In GTA Vice City, you can install the M60 in your assault rifle slot and use ammo for it and fire it while crouching!
In GTA 3 you can move and shoot at the same time, same goes for the peds.
How to install: Just drag and drop the data folder into your GTA (3 or Vice City) folder.
I have made different versions of the mod to suit your needs. There are also backups in case you want to go back I hope this guide helped you figure it out.