Won't stay where zeroed at - NcSTAR Red & Green Four Reticle Reflex Sight

Worse thing I ever saw! After bore sighting at 15 yards thought I'd pop a couple reds. First 3 there was an adjustment bullet strike needed to go down and to the left about 2inches. No place in the manual does it say how much change to expect on 1click either way up or down. Guessed and hit bull size of a quarter dead center. Next rd high and to right 1/2 in. Third round high about 3/4and right 1/2. Readjusted first rd dead center next two within 2 inches. Mind you this is at 15 yards I would have
Missed entirely at 50 yards. After 80 rounds and first round hits then all others way off I decided to quit wasting ammo.

Yes each adjustment I was loosening the lock set screw and tightening after adjustment I thought at first I wasn't tightening the lock screw enough but that is not true I may have over tightened after about 60 rounds because I knew then the optics were trash!!

DON'T WASTE YOUR MONEY LIKE I DID!!