The Sightmark Tactical Red Dot sight is the best way to zero in on any target with lightening-quick precision. Troubleshooting tips: The units shutting off are most likely occurring when the batteries are not installed vertically in which one is stuck in the battery cap at an angle. Reseating the batteries correctly solved this issue which is easiest to install the battery cap if the rubber lanyard is removed for that step. . The mount coming loose the user needs to confirm they are meeting a standard torque spec of 35 to 45 in/lbs, most likely they under tightened.