Helping with FA:S 2

I’ve been trying to add FA:S Weapons to my Dark-rp Server on GMOD, But for some reason, When i try and look at them, they look like CS:S Models, and not like the actuall models, And apperantly it happens to alot of people.
Is there any way of fixing that?
I tried looking in the script, and it says this:
“SWEP.WM = “models/weapons/w_ak47.mdl”
SWEP.WorldModel = “models/weapons/w_rif_ak47.mdl””
so the first wordmodel will be defined as your world model, and but second one will be as a CSS Model, can you explain that please?
In addition, i tried changing the SWEP.WM to the SWEP.WordModel, sometimes it works, and sometimes it doesn’t, If I try and spawn a model which wont work, when it spawns, it creates a green circle around it.
I looked it up, And the green circle means it an effect, not an actully prop/model.
Is there anyway I can recompile the models, and make them as a prop/model?
If there is please let me know how, so i can start doing so.
Thanks for all helpers!

SWEP.WM must be a custom variable. What is it defined as?