There is a scripts folder inside of the csgo folder. Inside you will see many files but the ones you are looking for have the prefix “weapon_”
so for AK47 you will find the file weapon_ak47, for AWP the file would be weapon_awp and so on.
If your poking around in these files and you dont know what your doing you should prolly seek help or back the ones your editing up and do the guess and see method. Editing these files will mess the game up if your not careful.
The directories are here:
Client: Installdirectory:\Program Files (x86)\Steam\steamapps\common\Counter-Strike Global Offensive\csgo\scripts