Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Smith & Wesson 13811 1854 45 Long 9+1 19.25" Black Armornite Threaded Barrel, Black Armornite Picatinny Rail Stainless Steel Receiver, Fixed Walnut w/Textured Grip Panels Stock, Large Loop” has been added to the compare list