In cooperative mode, have your friend kill you by hitting you in back with a melee attack. Then, have him pick up your ammunition, respawn again, and repeat. Have him keep killing you until he is full, then have your player pick up your ammo after he kills you. You will then have maximum ammunition. Note: this only works for the machine gun.
In some levels at corridors, you will see an orange flash when one of team passes through a checkpoint. When this happens, get one player to stand still and hold X to reload. while other player runs back down the corridor to make the orange flash appear again. When this happens, the player who has been standing still should now empty his magazine by firing off until the gun reloads itself. When the player that held X has obtained unlimited ammunition for that level, do the same with other player. Note: Once you have unlimited ammunition, let the weapon reload automatically. If you reload manually, change weapons, press X to enter any vehicle or gun turrets, or die, you will lose this effect.
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