The Armson Pro - Dot Sight. The only difference between the ProDot and the ProDot Max Duty is in the design. As far as characteristics go this sight is just as great. It's extremely durable as it is manufactured from aluminum (except for the front optic, which is a very tough plastic, and the rear optic, which is a glass lens). It does not require batteries, which in long term saves you money. The dot is very clear even in low-light conditions. The sight is very easy to adjust and zero and is also very steady so once you zeroed it right it will stay in place. Here's the provided information about this sight: ôThe Armson ProDot sight is the king of optical illusion sights. One eye sees a black circle with the red dot in the middle. The other eye sees the target and when you're brain puts it all together you see your target with a dot on it."