The bsp can go right into ccs. All the mats/models are from ccs it works just as is if you put it in the maps folder. It's from ccs and just runs in gmod as well.

Ah man. Then I think I'll have to rip it out of Garry's mod somehow, and then put it into CS. Though I doubt it would work correctly. You wouldn't have a clear CS:S version would'a?

Got it from old long gone counter strike source servers. Pretty good map. Use to play it on a gmod zombiemod I made with a friend.

Might I ask where did you get it from? Because I would actually play it in CS:S