Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Smith & Wesson 13952 M&P15 Sport III 223 Rem/5.56 NATO 10+1 16" Black Armornite Threaded Barrel, Black Picatinny Rail Aluminum Receiver, 6 Position Black Synthetic Stock, Black Polymer Grip” has been added to the compare list