"Reflex sight of Russian origin. Provides higher precision."
— Description
The Monocle Reflex Sight is available to all weapons that can accept attachments, with the exception of the sniper rifles, the X16, the 1911 and the M19.
The sight appears in Call of Duty: Vanguard as the Monocular Reflector. It is available to all weapons that can accept attachments, and increases the magnification by 1.35x.
Call of Duty: Modern Warfare II[]
"A minimal reflex sight of Russian origin."
— In-game description
The Monocle Reflex Sight returns in Call of Duty: Modern Warfare II as the Monocle CT90.