Holosun HE507Comp-GR. Used once and opted to go with smaller footprint optic. This is the green competition Holosun. Absolutely nothing wrong with it, one of the bags of screws were opened, but the screws are still in the bag. Comes with everything that optic comes with new. Bought new for $399

https://www.holosun.com/products/reflex-sight/507/he507comp-gr.html