How to gain XP faster in Call of Duty 4: Modern Warfare

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By mattrat3000
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This guide will show you how to gain xp faster in call of duty 4: modern warfare.

Difficulty: Moderate

Instructions

Step 1

Make sure to complete all challenges and always use a weapon you still need the headshot challenges with.
Step 2

Play games where there is lots of people for more opportunities to kill, spawn camp as much as possible and get headshots.
Step 3

Play free-for-alls, games where nobody is on your team means more people to kill.