Controling What weapons players spawn with

How would I go about controling What weapons players spawn with? For
example, I want to make a grav gun only map. How would this be done? In
the compiling?

PLEASE LIMIT REPLYS TO POSSIBLE ANSWERS ONLY

I apologize for linking to another forum. But here is an answer to the problem:

http://www.chatbear.com/board.plm?a=viewthread&t=218,1102125212,5366&id=741997&b=4989&v=flatold