I was reflecting on this during the evening and thought I would spout my opinion on another aspect of these sights that might be pertinent: the auto adjustment feature. I believe that Holosun has really missed the boat on this. It works OK when outdoors, but fails indoors. This is largely because the photovoltaic cell/arrangement (which also serves as the light sensor) is on top of the sight. This is measuring light from the wrong direction (above) when it should be measuring along the axis of the sight (forward). This leads to the famous "washout" phenomenon where the reticle disappears, usually when in a dim condition looking at a brighter area (e.g., out of a window). In other words, the light sensor is oriented 90 degrees off the direction it should be measuring. Also, there is a noticeable lag in adjustment times when light conditions change, maybe a second. The point being, if you plan to use this indoors, don't use the auto adjust feature.
Just for fun, this is what I have observed in some other sights:
Shield SIS (British military backup sight): seems to have a sensor aligned about 45-60 degrees off the sight axis; nice try but not that useful.
Trijicon ACOGs: with the light collection tubes and the etched reticle, these actually work well for a "self-adjusting" sight; the ones with longer tubes (e.g., TA11 series) are pretty hard to washout, but you can do it if you are in a dark area looking into a slightly less dark area at a dark target.
Trijicon RMR (electronic adjustment, Type 2): these do self-adjust, but there is a time lag and it never seems to adjust quite the way I would like; still a mystery.
Trijicon Tripower: a really magnificent fail; if three power sources can not find the right illumination balance, nothing can; the spiraling light collection tube, and the tritium illumination, was supposed to do this. Perhaps this is why it is no longer sold. See:
http://combatopticsreviews.com/trijicon-tripower-revie/
Finally, the Trijicon Reflex with forward facing light sensors: I have no experience with these, but apparently it did not perform as advertised; note the location of the light collection cells. See:
https://www.trijicon.com/discontinue...etails/rx06-23
Maybe someday someone will get it.
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