The Primary Arms MRS Mini Reflex Sight is a continuation of the new line of red dot sights designed specifically for mounting to pistol slides. The Mini Reflex Sight is optimized for full size carry pistols or competition guns as it features a large 24x17mm lens allowing for a quick and easy sight picture all while weighing under an ounce. It utilizes the popular 507c footprint for a wide range of compatibility with milled slides and adapter plates and houses a bottom mounted CR2032 battery offering up to 40k hours of battery life on the medium setting. With 10 total illumination settings, and a daylight bright 3 MOA red dot, this reflex sight is sure to be quick to pick up and easy to use. The lens is fully multicoated for scratch and fog resistance and the 6061 Aluminum housing is extremely durable. If, you are looking for a new red dot for carry, competition, or even your rifle, you can't go wrong with the Primary Arms MRS. Specifications for Primary Arms Classic Series 24mm Mini Reflex Sight with Autolive, 3 MOA Red Dot: Manufacturer: Primary Arms Color: Black Fabric/Material: 6061 Aluminum Magnification: 1 x Objective Lens Diameter: 24 mm Objective Window Size: 24 mm Reticle: 3 MOA Dot Illumination Type: LED Illumination Color: Red Brightness Settings: 10 Battery Type: CR2032 Battery Life: 40000 hours Weight: 0.98 oz Red Dot Sights-Footprint: RMR Package Contents: Primary Arms Classic Series 24mm Mini Reflex Sight with Autolive, 3 MOA Red Dot