An iron sight is the default sight in CoD MW2. It isn't really a good sight, but it'll get the job done.
iron sights are standard. however on Call of Duty Black Ops, you can upgrade your iron sights.
The iron sight is the default sight on any gun. Sight attachments would include red dot sight, holographic sight, ACOG sight, mars sight, and thermal sight. If you have a gun with no sight attachment, you have an iron sight.
