All GLOCK owners want a handgun with the MOS system optics cut! The Athlon Optics Midas TSR1-M Red Dot Sight is designed to eliminate any mounting issues on GLOCK handguns utilizing the MOS system. With 50,000 hours of battery life and motion sensor activation, the TSR series is always ready. The low-profile allows this sight to co-witness with appropriate suppressor height iron sights on GLOCK MOS slide-cut pistols. Thanks to its fully multi-coated optics, this site effectively reduces reflected light and increases the transmission of light giving you a brighter image than normal single coated lenses. Runs on a CR2032 battery. MOS system makes mounting on a GLOCK quick and simple 50,000 hours of battery life on medium setting Fully multi-coated for bright imagery Waterproof, fog proof, and shockproof Low profile