The UTG AR15 Ambidextrous 45/90 Safety Selector is not compatible with the M&P15-22. Unfortunately, we do not currently carry any M&P15-22 specific fire selectors.
I actually purchased this selector before receiving an answer, just to try it out.
Yes, it fits in the safety selector holes, screwed the parts together without any problem, and it functions properly. Much better than the stock S&W selector. Will be testing it at the range, but so far very pleased!
YES it does!! I purchased this for a M&P15-22, before reading the Q&A, and just finished installing it.