Trijicon RX06 Reflex sight and A2 carry handle mount.
These are awesome sights. Rugged, low profile, reliable, and no batteries needed, ever.
It is worn, having been there and done that, but it works perfectly. The aluminum housing has worn finish and has a minor dent in the top. The triangle reticule is bright in the day and the tritium lamp has dimmed to about 1/2 brightness at night.