Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“CMMG 28A490FMB Dissent MK4 22 ARC 10+1 16.10" Midnight Bronze Cerakote Picatinny Rail Aluminum Receiver, M-LOK Handguard, Black CMMG Dissent Side Folding Stock, Zeroed Drop-In Single Stage Trigger” has been added to the compare list