Back in ancient times, the 70’s, the idea of a quick pointing sight was a concept pursued by several companies. LED’s were just coming on the market and Aimpoint threw the first powered reflex sight out to the consumer. Armson and Singlepoint on the other hand, took a different approach in the 70’s, the Occluded Eye Gunsight. Unlike a reflex sight, there is no see-through around the red dot. The optics eye is blocked. To use the sight, you have to train yourself to keep both eyes open and overlay the dot onto your field of vision. You can do the same by simply keeping the front lens cover closed on a scope with an illuminated reticle. Give it a try! There main advantage is that they are very fast on target, particularly when it’s dark. With both eyes open, see it, put the dot on it and fire. I won a lot of beers being able to dance a can around before the person next to me could sight the can. The disadvantages are the zero is only good for one person and a certain range…not a long range sight, but very good for short distances. Training is needed in using this kind of sight. The front piece of my Armson is the light pipe for daylight use and the glass on the back is for magnification of the dot. Tritium illuminates the unit at night. Armson is going to replace the Tritium on my old sight so I can put it back in service. A modern dot reflex is a better overall choice today, but I still like this old workhorse. It will be good to get it back in service.