go to the cheat menu and then press down left down right down up then it should go back to the game and you still have your gun out then just fire and wach your ammo never go down. this is some thing that other cheat sites do not have i think only me and the people who made it know about it. no prob for the help. bye.
If you're struggling with the game and could do with the enemy being a little less accurate with their shots then pause gameplay at any time and press Up, Down, Up, Down. When the words 'Enter Cheat Code' appear at the corner of the screen enter Right, Left, Right, Down, Up, Right.