The term 'co-witness', when used to describe rifle optics, refers to how the sight's optical tube aligns with back-up iron sights (BUIS). This is determined by the height of the sight's mount (or the height above bore). There are typically two options: Absolute and Lower 1/3. An 'Absolute' co-witness means that the iron sights, when properly aligned, sit in the center of the sight's optical tube. A 'Lower 1/3' co-witness means that the sight tube is slightly higher so that aligned back-up iron sights sit slightly lower in the optical tube.
During our travels around the country teaching carbine and Aimpoint CCO classes to military units, law enforcement agencies, and armed citizens, we have discovered that there is a tremendous amount of misunderstanding about some of the most fundamental concepts in red dot sighting. In almost every class we teach, some or all of the students have been given bad information about how to use their Aimpoint and, as a result, have either chosen not to use it or have been using it less than optimally. We have found, unfortunately, that even seasoned veterans from military combat arms units (infantry, cavalry, combat engineer, etc) have bought into myths that reduce their...
‘Minute of Angle’ or ‘MOA’ is a term that’s used frequently to describe the accuracy of firearms, sights, ammunition, and other related equipment (i.e. ‘accurate to better than 1 MOA’). It’s also used as the basis for windage and elevation adjustments on quality sights and optics (i.e. ¼ MOA adjustments). Snipers become intimately familiar with the MOA during their training. It’s an important concept, though, for every rifleman- not just snipers- to thoroughly understand.
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