Austrian, not Australian. Yes, Glock did offer OD frames, but they have since been discontinued.
Blue,red,and yellow will give you olive drab.
M9 paper or olive drab tape
drab
Olive drab
OD (Olive Drab)
khaki
107, 142, 35.
M9 Paper
Green with gray or black depending on your hue of green. The color olive drab is subjective, however, I have seen it used most in the military for the color of hand grenades.
Green must be added with black to make olive drab green.
Olive drab tape
Olive drab tape