A purpose built .22lr like the M&P most likely will not pin to a mil-spec AR upper. If the rifle is built as a conversion the lower should be a standard AR mil-spec receiver. Best to check with the manufacturer since its your face in the danger zone. 
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"The whole of the Bill (of Rights) is a declaration of the right of the people at large or considered as individuals.... It establishes some rights of the individual as unalienable and which consequently, no majority has a right to deprive them of." (Albert Gallatin of the New York Historical Society, October 7, 1789)
"A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington
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