Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Smith & Wesson 170292 M&P Performance Center R8 357 Mag Or 38 S&W Spl +P 5" Black Barrel With Picatinny Acc. Rail, 8rd Black Cylinder, Black Scandium Alloy N-Frame, Synthetic Grip” has been added to the compare list