The SightPro Atomic 2.0 is ultra compact making it a superb choice for many applications. Thousands of test rounds had virtually no effect on its ability to hold zero. This rugged scope can handle shotguns, as well as magnum revolvers, but can easily be used on rimfires, and has become a popular scope for AR rifles. Weighing in at only 3.8 oz., it can even be used with archery equipment. The 4 MOA dot can be illuminated in both, red and green with 5 intensities for each color to accommodate all lighting conditions. It also comes with a dual mount that can match either a 7/8" or a 3/8" rail to fit on a standard Weaver style base or a .22.