For 0ne thing, you can't see a damn thing through the little window. I mean this window is litteraly 5/16" x 5/16" and over an inch long. Hold that 20 inches in fron fo you and try to look through it.
On top of that, the dot rojected inside of it takes up 2/3rds of the "window" so forget about really seeing your target. The final straw is that their is no "glare gaurd" or wings over the the back of the window, so the slightest light source from behind you (like reflections from clouds, streetlights, houselights, the sun...) makes it even more impossible to see into the window.
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