You might consider giving this one a try too. I have one (5.56 model) on my M&P 15 and (7.62 model) on my M&P 10, very snazzy if you can find them in stock. Fits and works great!

Rainier Arms™ | Browse | Replacement Parts - Upper | Rainier Arms Raptor Ambidextrous Charging Handle - 7.62MM

Rainier Arms Raptor 7.62