The RugerReadyDot is an ultra-reliable 1X reflex sight designed specifically to co-witness with the Ruger MAX-9 pistol"" but the low profile sight fits any compact handgun with a standard Shield RMSc footprint. It is a fixed"" non-adjustable sight with a large 15 MOA dot optimized for rapid target acquisition at pistol distances. The fixed co-witnessed dot avoids the necessity for delicate adjustment mechanisms making this one of the most rugged and reliable"" waterproof and shock resistant pistol optics available.