M16 with a M203 underbarrel for GTA San Andreas

Now in GTA San Andreas with M16 grenade launcher underbarrel appears,
only do not stand very close to the object in which you shoot still blast after a shot is such that it can easily fill up you are, the more it works in 2 modes:
1-th mode is a mode of grenades (works best for battles against helicopters);
2-th mode is a mode of missiles (best used in battle on a flat surface).

to activate a script in a 1-ohm mode G + R,
to activate a script in a 2-ohm mode M + I
to disable a script N + O
for the shot, use sight + looking back, the first aim, and shot for click wheel.