The NcStar Micro Reflex Red Dot Sight is great for use on everything from a 22 caliber handgun to a hard hitting shotgun. This sight features an aluminum body with heads up display for fast target acquisition. At only 1.8" long and weighing in at only 1.3 ounces you will hardly notice that this sight has been added to your firearm. The 2 MOA dot size is great for shooting out to 100 yards, or farther if your target is large, and the integrated Weaver-style mount works on any Weaver-style and most Picatinny bases. Powered by a CR2032 3V lithium battery.