use a sniper
The Pinpoint Sight is an add-on that features a red-dot and crosshair targeting system.
It isn't in MW3. It's basically a red dot sight with a customizable center dot.
Reddot Air Duct & Vents Care
A sight with increased zoom for your weapon.
The red dot sight from Call of Duty: Modern Warfare 2 was only available during the builds of MW3 and was never actually released for the game. For unknown reasons the red dot sight from MW2 was cut and they used a similar model from the original Modern Warfare but with changes. But an AK-47 with the MW2 red dot sight can be found in MW3 in the spec ops mission "Kill Switch".
a red dot sight
The holographic sight is a sight with a 1.5x zoom. The hybrid sight is a combination of both the red dot sight and holographic sight, you can switch between the two at any time. The hybrid sight is only in MW3. Related links have been added that describe the features of both sights
You can have both attachments on if you unlock the gun perk that lets you have two. ie, kick, focus, attachments
mw3 is part of mw3, it's call of duty mw3
mw3
mw3
There are 10 Prestiges in MW3.