I really like the RX 30 for a battery-less option, with the exception of the dot washing out when shooting from the shadows into bright sunlight or when using a weapons light at night, especially inside. These deficiencies can be compensated for by mounting fixed sights, front and rear. Inside at night with lights off, you will easily see the tritium dot, then when you hit your weapons light, the front iron sight comes immediately into view for a seamless transition. Shooting from the shadows, same thing. At CQB distance, you really only need the front sight picture, and for longer shots, you can take a little more care to line up your shot through the iron sights if needed. I have one gun set up like this with Daniel Defense fixed irons and a lower 1/3 co-witness.
By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest. - Confucius
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