Mite give you a idea-I'm looking for one of these in a 9mm, what's the going price for these now.
I second this. The M&P is a great gun.Look at the S&W M&P 15-22 if you are looking at 22lr. Same ergonomics as an AR. Even comes apart the same way.
You only get about 150 fps boost in a 9 or 40.