Smith & Wesson 812000 Stripped Lower Receiver 223 Rem, 5.56x45mm NATO 7075-T6 Aluminum Black for S&W M&P15 $135.30
Smith & Wesson 812002 Assembled Lower Receiver 5.56x45mm NATO 7075-T6 Aluminum Black Receiver, Black Synthetic Collapsible Stock Pistol Grip for S&W M&P15 $331.10