The speed and versatility of a red dot goes unmatched in close range engagements. Whether you are running an AR or PCC in competition, hunting, or running a red dot on an optics ready pistol, the TSR series of red dots has you covered. With 50,000 hours of battery life and motion sensor activation, the TSR series is always ready. Furthermore, you can mount the sight on select handgun models, such as Glock, by taking off the picatinny rail mount and mounting it on the adapter plate (sold separately). To remove the picatinny rail mount, loosen the two top screws on the main chassis. Mfg: Athlon Optics