the b mista

Ok, here is the list of all the codes. Well, the ones that work.
Since I don't know if you have the xbox or ps2 version i'll give you both
Ps2:
First at the loading menu enter this code: hold L1 and R1, now press down,O,up,square,down,down,up,up, now release L1 and R1.
Since the cheats are the same no matter what ill first tell you how to unlock the cheat option for xbox.
At the main menu: hold the left and right triggers, press down,x,up,y,down,down,up,up, now release the left and right triggers.
Once you enter one of these ( depending on your console)
You can now enter any one of these codes in the new ''cheat'' option;
KKtigun-pistol
Kkcapone-machine gun
KKsn1per-sniper rifel
There are other codes, but you said you wanted guns, I don't know any for the shot gun. Oh and if you here a ''whoosing sound'' when you enter the code, it worked. If you hear a ''clicking'' sound, try again. Hope this helps