put the rif_famas.vtf in
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VVVVVVVVV

C:\Program Files\Valve\Steam\SteamApps\account\counter-strike source\cstrike\materials\Models\weapons\v_models\
CREATE THE FOLDER----->rif_famas-=-and put the rif_famas.vtf inside the folder u just created

____________________________________________
put the w_rif_famas.vtf in
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VVVVVVVVV

C:\Program Files\Valve\Steam\SteamApps\account\counter-strike source\cstrike\materials\Models\weapons\w_models\
create the folder------>w_rif_famas
and put the w_rif_famas.vtf in the folder u just created