                                  ~~~~BACKUP PAK01_dir.vpk~~~~

Put the files in folders(csgo\material\models\weapons...)

Open your pak01_dir.vpk file with notepad++ then press Ctrl+h to replace the following:

$basetexture "models\weapons\v_models\snip_ssg08\ssg08" --REPLACE--> $basetexture "models\weapons\v_models\snip_ssg08\ssg09"


                                Save pak01_dir.vpk