Mastering the Backup: How to Co-Witness Iron Sights with a Red Dot

As electronics become more reliable, the red dot sight has become a staple on duty and personal defense pistols. However, any electronic device has a potential point of failure. This is why understanding how to co-witness iron sights with a red dot is a critical skill for any serious marksman.

Co-witnessing refers to the ability to see your iron sights through the window of your optic. There are two primary types: Absolute Co-witness, where the red dot sits directly on the front sight post, and Lower 1/3 Co-witness, where the iron sights sit in the bottom portion of the window to provide a less cluttered view.

To achieve a proper co-witness, many shooters must install "suppressor-height" sights, as standard-height factory sights are often too low to be seen over the base of the optic. The goal is not to use both simultaneously, but rather to have the iron sights available as a physical reference point if the red dot’s battery fails or the glass becomes obscured. Properly aligned backup sights provide the ultimate peace of mind for those who carry daily.