Okay this isn't really a cheat but I figured out how to get the mini gun. Go to the Wang Fou mission and go to Lee Hongs mansion. On the top floor there is a desk and on the desk is a key card. The key card unlocks the door in the asylum that the crazy is in that has the mini gun. Pick up the key card from Lee Hongs desk and then do the level skip cheat. Then go to the asylum(you don't have to epuip the key card at the beginning it is automatically equiped for you). Go to the door and kill the guy with the mini gun and take it. Then do the level skip cheat again and save your game. Now you have the mini gun.
Added by: manchu5 Jan 13th 2006, ID#19117