You will find 8 varieties of ammunition issued to be used during the M2 Browning .fifty caliber machine gun, with the information of the assorted rounds shade-coded to point their form; these involve: Smaller automatic guns that use cartridge magazines are classified as automatic rifles, assault rifles or submachine guns. https://machguns.com/product/colt-ar15a2-converted-to-full-auto-sp326814/