Red Dot Sight

A Red Dot Sight is a type of reflex sight that specifically uses a Red Dot Laser on the middle as a reticle and precise aim. It appears in Call of Duty 4: Modern Warfare and Call of Duty: Modern Warfare 2.

Call of Duty 4: Modern Warfare
In Call of Duty 4: Modern Warfare, the Red Dot Sight is available for all weapons except sniper rifles, pistols, and the MP44 assault rifle. When selected as a weapon attachment, the red dot sight replaces the weapon's iron sights. In multiplayer, the Red Dot Sight is obtained by completing the first marksman challenge (killing 25 enemy players in total with the specified weapon) of any Assault Rifle, Submachine Gun, Light Machine Gun, or Shotgun. The Red Dot Sight is popular because it allows full peripheral vision and is clearer and easier to use than iron sights. However, the Red Dot Sight does not actually increase the weapon's accuracy.

Call of Duty: Modern Warfare 2
In Call of Duty: Modern Warfare 2, the Red Dot Sight has some changes. The new model is square, smaller, less obtrusive, and allows for a better peripheral view. For the most part, it is similar to the Red Dot Sight in Call of Duty 4. Some weapons now have their own unique Red Dot Sights. The TAR-21 uses the MARS Sight and the F2000 also uses its own red dot sight. All Red Dot Sights, except for the F2000's, are disabled when an EMP is deployed. Getting 60 kills while looking down the red dot sight unlocks the Holographic Sight for primary weapons.

Trivia

 * In Call of Duty 4, the red dot sight reduces the AK-47's minimum damage from 40-30 to 40-20.
 * In Call of Duty: Modern Warfare 2, there are Akimbo TMP's with Red Dot Sights, however, the Sights serve no purpose.
 * In Call of Duty: World at War, there appears to be some sort of advanced version of the Red Dot Sight on the Ray Gun.