I don't have a M&P but I put Crimson Trace Laser grips on my Kimber.
If you'll notice the right side safety.
It was bobbed (shortened by my gunsmith).
He charged my $25 and did it while I waited.
You should ask a gunsmith or CT or S&W if that can be done for you on your M&P.
By the way everything works fine .
Your gonna love the Crimson trace Grips.