Not having that issue, but I did almost lose the rear sight on my first range visit. Had to line it back up and loctite the set screw in place rendering the sight as "somewhat adjustable." I have seen rear sight issues pop up in several reviews. Be careful with that takedown lever. That pin literally falls right out once aligned.
Yea though I walk through the valley of the shadow of death, I will fear no evil. My rod is a GLOCK and it comforts me