In stock right now at Laylax is the Sightron Japan SD-30 Dot Sight in Magpul Dark Earth Cerakote Coating. According to them, you can aim with both eyes open with almost no eyestrain. This is a 30mm diameter sight with 11 level of power powered by CR2032 battery. It comes with a honeycomb Kill Flash filter/lens protective shield, and mounting ring for hex wrench.