how to make weapons in left 4 dead 2 (Left 4 Dead 2)

I searched everywhere and found nothing
Very bad looking for my friend. There are programs for 3D modeling, but without any skills, the most you can do is exit the program. Although skill and work ...

Look in pak_dir01.vpk, which is unpacked by the GCFSpace program, if you draw skins, then it's easy, if you change the model, then yes - 3D modeling.