this is a pretty simple mod, i just swapped the weapon scripts around and now we get CSS weapons too .

YouTube - L4D2 Gun Mod (CS Guns Non-German)

the awp didn't work so i removed it.
mp5 and scout both work fine.
sg552 has a little glitch in the model and zoom doesn't work but it's playable.

these will spawn in game too

Download link:
CS weapons.rar