Works great - Holosun HE515CT Micro Red Dot Sight

Solid optic at affordable price. The only concern I have is with the battery tray. First the o-ring has a thick side that goes down and a thinner side that goes up so that it fits properly into the optic body and it's not necessarily put on the right way around from the factory. It's easy to take it off and turn it over just be aware. Also they use what have to be the smallest torx head screws in existence. Be careful or you can strip them or destroy the tool they send to tighten them. I have a precision screwdriver set that does a better job and feels much safer.