Factory Smith & Wesson AR-15 Stripped Lower Receiver marked M&P 15. .223 Remington / 5.56 NATO. If you have an AR15 planned in your future, build it on a great base with this lower. This is a stripped lower, nothing else included. Featuring a blued finish. The Smith & Wesson Stripped Lower Receiver for the MP15 requires an FFL to ship to. You will be contacted after your purchase in order to get your FFL information. The Smith & Wesson Stripped Lower Receiver for the MP15 will not be shipped to California or to residents of states where it is prohibited.