Drag vtf file into Computer\OS(C:)\Program Files\Steam\steamapps\(your username)\counter-strike:source\cstrike\materials\models\weapons\v_models once you got into the v_models section drag snip_scout into your snip_scout file if you are replacing the skin get rid of the old vtf file and replace it with the new one. If you don't have the snip_scout file make a new one called "snip_scout" without quotations.Put the vtf file in the snip_scout file once you made it.