i know that u gotta unlock em, im almost master sergent but i remember that you can change the code to unlock stuff
That was only in the demo, doesn't work with the retail version of the game. Solution: Do it the real way.
there is no code to unlock the weapons! cheats will also not work. check this page for ranks and unlocks http://ubar.bf2s.com/ranks.php
u can hac the game but only on single player or else EA finds u and u get banned and other than that u have to unlock