Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Glock UX4350204FRMOSNURBST G43X MOS Slim Sub-Compact Frame 9mm Luger 10+1 3.41" Black GMB Barrel Urban Stonewash Cerakote MOS Cut/Serrated Steel Slide & Polymer Frame w/Beavertail, Ambidextrous” has been added to the compare list