With this mod you can handle two guns for several weapons

These are the different packagges


Realistic

-silenced 45mm
-Desert Eagle
-SPAS
-SMG


Impossible

-silenced 45mm
-Desert Eagle
-SPAS
-SMG
-AK47
-M4

Unreal

-silenced 45mm
-Desert Eagle
-SPAS
-SMG
-AK47
-M4
-Rocket Launcher
-Rocket Launcher HS

To install it just choose the packagge and copy the weapon.dat
in tour GTA SA data folder