Failed first range trip - ADCO 1x 3 MOA Red Dot Reflex Sight

I mounted this on a Ruger MK III 22 pistol. First range trip the red dot quit appearing after about 50 rounds. The green dot illuminates so i am keeping it for another range trip. If that goes I am returning it. Everything else works as it should. I examined the box it came in after the red dot quit and observed scotch tape along the edge holding it together. May have been a previously returned item. I'm not sure what the return policy is but wish I hadn't waited until just over 60 days to get to the range. THAT won't happen again. If you get one of these try it out immediately.