Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Sig Sauer 320XF9BXR3PR2 P320 XFull 9mm Luger 17+1 4.70" Carbon Steel Barrel, Black Nitron Optic Ready/Serrated SS Slide, Black Stainless Steel Frame w/Picatinny Rail, Black XCarry Medium Polymer Grips” has been added to the compare list