[ReBel]

To get all weapons, start the game with this commandline:

+set developer 1 +set ui_console 1 +set thereisnomonkey 1 +set cheats 1 +map m3l3

Once the game starts, type "wuss" in the console and you will have all weapon.
I did the same thing only because I wanted to try out all the weapons. The bazooka and the m44 will not have sounds however.

If anyone wants to flame me for posting this, remember three things: first- this information can be found easily, second- I think its fine to want to play/test with all weapons, third- I'm the guy that came up with the MP Cheat Fix, because I can't stand player vs player cheating either.