Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“FN 66101277 Five-seveN MRD 5.7x28mm 10+1 4.80" Black Steel Barrel, Flat Dark Earth Optic Cut/Serrated Steel Slide & Polymer Frame w/Picatinny Rail, FDE Textured Polymer Grip, Ambidextrous” has been added to the compare list