Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Glock PX4350201FRMOS G43X MOS Sub-Compact 9mm Luger 10+1 3.41" Black GMB Barrel, Black nDLC MOS Cut/Serrated Steel Slide, Black Polymer Frame w/Picatinny Rail Black Textured Polymer Grip, Ambidextrous” has been added to the compare list