Call of Duty: Modern Warfare 2 - Best M4 Loadout/Build

It's safe to say that most veterans, if they have only one weapon with a favored loadout in Call of Duty: Modern Warfare 2, will choose the M4. As the starter weapon, mastering this gun is key to getting through the early stages after a prestige. The better they are with the M4, the more painless this process will be.