Need help - model isn't set up properly

[kapach333]

hey guys.

So I'm trying to learn what is hexing, when to do it, and to what models.

I took this skin from game banana - [url]http://css.gamebanana.com/skins/136959[/url]

I set the view model from the skin. The world model is set from another swep because I'm just testing the model.
So, the problem is in the view model, instead of showing the Carboned Edition skin, its showing a regular AK47 from the original css!!

video - [video=youtube;SPLAIjOwDJY]https://www.youtube.com/watch?v=SPLAIjOwDJY&feature=youtu.be[/video]

Questions -

1) Do I have to hex this weapon? why?

2) why is it shown as a regular AK47 and not as the skin?

3)What did I do wrong?

thank you, ladys and gentelmen.