Modern Firearms are defined by the ATF as firearms built after 1898.
Compare“Steyr Arms 610501 HS .50-M1 Take Down Design, 50 BMG 5+1 24" Fluted/Threaded, Black, Fully Adj. Chassis, Muzzle Brake, Adj. Integrated Bipod & Monopod, Optics Mount” has been added to the compare list