The Burris FastFire 3 are their top-selling Red Dot Sights. This is a super-versatile reflex sight, available in a 3 MOA or 8 MOA red dot reticle. Using a Picatinny/Weaver mount, the Burris FastFire 3 can be put to work on a rifle, shotgun, or handgun with a simple installation. Use it as the primary sight or mount it on top of a longer-range primary to serve as a close-range or backup sight. The Burris FastFire III Reflex Red Dot Sight has automatic brightness sensors to match lighting conditions on the fly, or you can use the 3 manual settings. Plus, the battery compartment has a top-access hatch so you don't have to remove the optic to swap it out (CR1632 battery included). There's an 8-hour automatic time-out feature, and, depending on how much you use the red dot sight, a battery could last for up to 5 years! Compact, tough, and reliable, you just can't go wrong with a Burris FastFire 3.