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No the 15/22 guns are not true AR 15s and therefore are not Milspec

No, first this is a polymer lower so even if it could I wouldn't really trust it with anything above 22 lr. Second as Randy said they're not milspec. Hope this helps.

John, no Sir, not AR-Mil-Spec. Also, The M&P 15-22 lower is wider than the standard AR15 upper. And the M&P 15-22 lower will not fit on an AR15 upper.

John, no it will not take AR15 uppers, and as Josh said, it is a polymer lower. Have a great day!