I purchased a Sightmark Ultra Shot QD Red Dot sight some time ago to use on my S&W M-22 rifle. I recently mounted it on my newest AR-15 build for test firing. After a couple of rounds, the dot disappeared. I did a little research and decided to get some new batteries when I found that it came with some generic batteries. Went back and shot a couple more rounds, the red dot disappeared again. Has anyone else had this experience with this sight? if so, any recommendations.

I just watched a YouTube video about this. Mentioning something about the battery screw door needing to be extremely tightened. Here's the link to the video:


https://youtu.be/HwiN9oD86bk

Seems like I remember several reports of these optics failing. It may be ok on the 22, but Sightmark is junk IMO. My brother got 2 a few years ago to play around with they both crapped out.

Save up, get you something decent that you aren't having to fight with. For budget optics, check Vortex, Holosun, and Primary Arms.

In a word, "no."  Your experience is typical.  I am a victim, myself.  There are other budget options suitable for non-duty range toys. Bushnell's TRS-25 comes to mind.