Just read the entire thread; I've been remiss in getting back on the S&W forum due to two new firearms I've acquired (well, one is just changing my Thompson pistol into a rifle, the other, a brand new Colt M4).
I had no idea nobody had made an ambi selector for the M&P15-22 so I'll be keeping this thread in mind.
I've gotten used to a ambi-safety for my Beretta 92FS and my SA 1911 so when I got into rifles, I thought it'd be the same but guess again! So I'm in for this little USA made product. Thanks Jon for taking up the cause - and yes, I'm a lefty but have been using my trigger finger to select fire/safe modes.... now how about a left hand charge handle????