Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Ruger 8638 American Duty Frame 9mm Luger 10+1 4.20" Stainless Steel Barrel, Black Nitride Serrated Stainless Steel Slide, Black Polymer Frame w/Picatinny Rail, Textured Wraparound Grip, Right Hand” has been added to the compare list