Once upon a time I already made a similar mod, but here it works a little differently. This script expands the arsenal of all gangs in San Andreas. Bandits can now have all types of firearms and more.
To work, you need the CLEO 3 library (CLEO 4 is not required). The Weapon_gangs.cs file is simply placed in the CLEO folder.
By the way, this script is especially interesting if you use the MROEMZH cheat (gangs are everywhere).