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George, yes sir, this will work in your M&P Sport II. Stay safe & have a great day!

Absolutely, buyem & runnem!!!

Hi George and welcome. Yes, the Smith and Wesson M & P 15 sport 2 AR 15 rifle is barrel stamped 5.56NATO and will fire both 5.56 and .223 ammunition no issue. Cheers and stay safe!

George, they sure will. These will fit and function just fine in your Smith and Wesson M&P 15 sport 2. I've shot these in multiple AR-15s with good results. So you're good to go. Hope this helps.