Must have gotten a bad one - hopefully replacement will work - AIM Sports 1x20 Dual Illuminated Micro Dot Reflex Sight

Inexpensive Red Dot. I got this for a new build. I zeroed the dot easily first time out. Second time out the zero had shifted. I re-zeroed and it seem to hold good zero from that point on. I decided to shoot the gun at my next AR-15 match. On the first stage, the dot turned off after the first shot. I was able to get it back on by adjusting the knob. I thought this was an odd problem, so I changed the battery with a fresh one and tried again at the next match. The same thing happened midway thru the first stage. Something on the inside or the controls don't like recoil (223). Now, I've been waiting about a month for the replacement. We'll see if it is worth the wait.