So, since I leave right of the interstate in Meth county USA, and after talking to some of the local cops, I decided to get a pistol light for my M&P.  Ended up getting the TLR1 by streamlight.  Damn this thing is bright!  I read some reviews that if you have light walls, all those lumens will just bounce back at you and blind you as well.  Luckily I have brown walls so that isn't a problem, but after playing with it at my parents house this weekend, I can confirm that white walls are blinding.  Anyway, I also had a Burris Fast Fire 3 on my AR.  When I bought it, I didn't realize that it was a mini red dot sight.  So, I bought a riser and tried to make it work, but the glass is just too small.  So I got the adapter and installed it on my M&P tonight.  I'll have to play around at the range a bit with it, but so far I am happy with it.  
http://i.imgur.com/HvsHJKY.jpg?1