Looking for a lightweight, reliable, quality red dot for your rifle or pistol? Look no further. The Sig STS-081 features 11 brightness settings, up to 8000 hours of run time on one battery, and a 4 MOA dot. These optics mount right to your picatinny rail with an Allen screw. All optics include a lens cover and battery. Original packaging not included. These optics have never been mounted.