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This guide will show you how to gain xp faster in call of duty 4: modern warfare.
Make sure to complete all challenges and always use a weapon you still need the headshot challenges with.
Play games where there is lots of people for more opportunities to kill, spawn camp as much as possible and get headshots.
Play free-for-alls, games where nobody is on your team means more people to kill.
eHow Article: How to gain XP faster in Call of Duty 4: Modern Warfare
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