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William, If the accessory you are asking about is compatible with a standard AR 15 with a carbine length non railed hand guard, back up magpul rear sight and A2 front sight gas block combo, or a muzzle device with 1/2x28 thread pitch it should be compatible.

William, The S&W MP Sport II's Barrel is Stamped 5.56 so it will handle any 5.56 or 223 factory load available Sir.