Mars Sight

The MARS Sight (International Technologies Lasers Multi-purpose Aiming Reflex Sight) is a reflex sight and laser.

Call Of Duty: Modern Warfare 2
In Call of Duty: Modern Warfare 2 multiplayer, the MARS replaces the Red Dot Sight on the TAR-21. In single-player, the TAR can be found with both the MARS and the Red Dot Sight. In multiplayer, the MARS is automatically identified as Red Dot Sight. The MARS has the same ADS time, turning speed, and accuracy as the standard Red Dot Sight. 60 kills with this attachment on the TAR-21 will unlock the Holographic Sight.

On the Create-a-Class menu, it names the MARS as the Red Dot Sight, possibly because it is essentially the Red Dot with a different skin. The sight is also known to be compatible with the M16 Series rifles. However, the M16A4 is never configured with the sight. A common misconception is that the F2000 uses the MARS. This, however, is incorrect as the F2000 uses its own dot sight. The MARS gives less zoom than red dot sights.

The MARS is significantly thicker at parts than the red dot sight, decreasing peripheral vision both while aiming down the sights and whole holding the gun at the hip.

If an enemy uses an EMP, the MARS sight, like other electronic optics, will disappear.

When using this sight with a Heartbeat Sensor, via the Bling perk, you can still see the sensor while looking down the sight. This is the only scope/electronic sight in Call of Duty: Modern Warfare 2 that can do this.