The T.M.P.R. M3 is the perfect primary or back-up sight for a rifle, pistol or shotgun. It has a 3 MOA red dot reflex sight has an automatic and three manual brightness settings. Accuracy can be fine tuned with simple windage and elevation adjustments. Eye Relief - Unlimited MOA Adjust Increment - 1.0 MOA Parallax Free Elevation Adjustment - 115 MOA Windage Adjustment - 86 MOA Weight - 1 oz Length - 1.9"