Change Gang Weapons Manually? Yes, It's very easy with using my mod!!
Just Dolwnload it, Copy files into your CLEO Folder in Your SA Directory.
Go to CLEO_INI\gangweps_conf.ini.
Example :
You want to change Ballas Weapons to Katana, Pistol, Tec9
First, find this Weapon IDs. (8, 22, 32) Find the Ballas section [ballas].
Then, in the file (gangweps_conf.ini) replace the Weapon IDs.
Like this :
[ballas]
ballas1=8
ballas2=22
ballas3=32

Finally, Save it.
Have nice time ;)

A Good online list of weapons is here :
http://wiki.sa-mp.com/wiki/Weapons

Requirements :
* CLEO 4
* GTA SA US 1.0

Sorry for my bad English.