Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Walther Arms 5220300 WMP Optic Ready 22 WMR 15+1 4.50" Stainless Steel Barrel, Black Optic Ready/Serrated Slide, Black Polymer Frame w/Picatinny Rail, Black Polymer Grip, Ambidextrous” has been added to the compare list