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Most inexpensive red dot sights comes in two types: 1) the head-up version; and 2) the scope version. They both present a red dot to the shooter, in place of a traditional crosshair. But what is the real difference between these two types? We will attempt to answer the question in a theoretical and practical manner in this article.
Before we go any further, let's take a look at an example of each type so that we know exactly what we are talking about. The photo below shows a red dot scope on the left side and a red dot head-up sight on the right. The head-up sight resembles a head-up display (HUD) of a fighter jet.
Of course, this article discusses red dot reflex sights in general. There are always going to be extreme cases of each type that doesn't match the description of the information presented here.