Co witnessing - what exactly is it? I asked this question when I was doing the initial research for our tube style reflex red dot sight. Someone asked me a question and referred to co-witnessing so I went down the rabbit hole! Haha

For super fast target acquisition check out this reflex red dot scope, learn more. 

Co-witnessing refers to the practice of using multiple sighting systems, such as iron sights and a red dot sight or holographic sight, on a firearm at the same time. The idea is that if one sight fails or becomes obstructed, the shooter can quickly switch to the other sight and continue to engage targets. Co-witnessing can be achieved by having both the iron sights and the red dot sight/holographic sight mounted at the same height, allowing the shooter to look through the red dot sight or holographic sight and still see the iron sights in the same field of view. This way the shooter can maintain a proper sight alignment and target acquisition in case the electronic sight battery fails or the electronic sight malfunctions.

It's a useful technique that helps increase the shooter's accuracy and versatility in the field, and it's commonly used by law enforcement, military, and competitive shooters. Keep in mind that co-witnessing only works properly when the iron sights and the electronic sight are zeroed and aligned at the same point of impact.