Hey,
here are all the available gsc files from the Call of Duty games.
Do not wonder, sometimes their scripts are more than horrible.
Click me
CoD1
CoD1-UO
CoD2
CoD4-MW1
CoD5-WAW
CoD6-MW2
CoD7-BO1
CoD8-MW3
CoD9-BO2
Yes, some are freely available (the versions where modtools were released), but it might be helpful anyways.
I'll update this when I reinstall CoD4 and CoD5 hopefully soon.