AT4 - Call of Duty: Modern Warfare 2 wiki

Damage 750 
Magazine Size 1 Rocket
Unlocked at
Starting Ammunition 1 (loaded)
Maximum Ammunition 1 + 1
Fire Mode Single-shot Launcher
HUD icon

This AT4 is the first rocket launcher to be unlocked, at level four, and is also part of one of the default classes. Unlike in the campaign, the player does not discard the apparatus after firing the rocket. It is capable of both free-fire and lock-on, although it does not do as much damage as the Stinger or Javelin to any aircraft. It does the same amount of damage as the RPG-7 against infantry, although with a smaller blast radius and only one rocket. However, it is far more accurate, especially at range, and can be lock-on fired. Like the others, however, the player must be aiming down the sights in order to fire.