I have had my M&P 15-22 for three years. It has the older (non flip up) sights. I use a Vortex Strike Fire II red dot. I like the standard front post sight. Will a flip up Magpul type rear sight line up properly with the standard front post?
I also mount a Nikon P-22 scope on it from time to time.
Great rifle - never had a problem with it.