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THe Optima can be used with 2 batteries right out of the box, the arredondo mount allows you to use 2 of the thicker batteries for longer life but only when the scope is bolted to holes tapped into the slide, a neat setup. I do not think the system will work on Glocks as you need to drill deep into the slide. As for dot brightness, I have never had a problem seing it in extremely low or bright sunlight conditions.
Matt K
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