MIL-G-13665, MILITARY SPECIFICATION: GUN, MACHINE, BROWNING, CALIBER .30, M1919A6 (WITH SPARE PARTS) (24 SEP 1954) [NO S/S DOCUMENT]., This specification covers one type of Browning, Caliber .30, Machine Gun, with shoulder stock and biped mount, and known as Gun, Machine, Browning, Caliber .30, M1919A6.