Mars Sight

The MARS Sight is a replacement for the Red Dot Sight on the TAR-21. It is featured in Call of Duty: Modern Warfare 2.

Call Of Duty: Modern Warfare 2
In Modern Warfare 2's multiplayer, the MARS replaces the Red Dot Sight on the TAR-21. In multiplayer, the MARS is automatically identified as Red Dot Sight. The MARS has the same Aiming Down Sight time, turning speed, and accuracy as the standard Red Dot Sight. Sixty kills with this attachment on the TAR-21 will unlock the Holographic Sight.

On the Create-a-Class menu, it incorrectly names the MARS as the Red Dot Sight, possibly because it is essentially the Red Dot with a different skin. A common misconception is that the F2000 uses the MARS. This, however, is incorrect as the F2000 uses its own Red Dot Sight.

Many people dislike this sight, and instead choose the Holographic Sight once it is unlocked. This is because the MARS blocks a lot of the peripheral vision, not only that, but the sight can be foggy and hard to see through in bright conditions. However, the Heartbeat Sensor is visible while aiming down the sight when equipped with Bling and the Mars sight.

In campaign, it is possible to find a TAR-21 with a labeled MARS sight, used by the Russian Army, especially in "Second Sun". The SWAT use The TAR-21 with MARS shigt in "No Russian"

It's also possible to obtain a TAR-21 labeled MARS Sight in the Museum.

Trivia

 * During the campaign, a TAR-21 can be found with a normal Red Dot Sight.