Only works in single-player maps with Panzerfausts. May not work in later patches. Make sure you have a full inventory. If one of your primary rifles are low on ammunition, exchange your rifle with a panzerfaust. Shoot the panzerfaust at any direction and pick up your rifle. You will find your rifle ammo increased. Note : Don't do this cheat if you have a full or near-full ammunition. You may find yourself have lesser ammo.