Shadtiger

The factory mount for a HK G3, which is what the model in the game is taken off of is open underneath and you can indeed look down the "Irons" though they aren't true irons. They are set for 100, 200, 300 and 400 meters on a one click clockwise rotation on the rear sight piece and have a "halo" forward sight which allows you to "Hide the Ring" and get a good shot on factory sights. As with all things HK, the G3 "Irons" are remarkably accurate. I miss my old peashooter.