This cheat only works for Tec9's,Micro SMG's,SMG's,M4's, and Combat Shotgun's. Here is the cheat. Go into Ammu-Nation. Go into the Ammu-Nation shooting range with your choice of weapon (Tec9's,Micro SMG's,SMG's,M4's or Combat Shotgun's) equipped. Right away, go out of the shooting range. You will notice you have more ammunition for that particular weapon. Keep doing this until you get infinite ammunition for that particular weapon.