Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“CMMG 55A830B-AB Dissent BR4 5.56 NATO 10+1 16.10" Black Nitride Medium Taper Barrel, Black Armor Cerakote Picatinny Rail Aluminum Receiver, 13.50" M-LOK Handguard, Magpul SGA Black Polymer Stock” has been added to the compare list