The Primary Arms MRS Mini Reflex Sight now features AutoLive technology paired with the extremely popular green illumination. The AutoLive feature turns off when idle and automatically turns on at the slightest motion, helping conserve battery life. This Mini Reflex Sight is optimized for full-size carry pistols or competition guns, featuring a large 24x17mm lens that allows a quick, easy sight picture while weighing under an ounce. It uses the popular 507c footprint for wide 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 green dot, this reflex sight is 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.