Great optic overall - Mepro OPMOD M21 Red Dot Sights Reflex, HC Reticle

Great optic. The auto adjust brightness works great unless you are in low light aiming into bright light however, you can still see the reticle just dimmer. On the heavier side and a little bulky but huge field of view. If water gets in the emitter area and distorts the reticle either, shake it or blow it out. Then works fine