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| | AR-15, M16, M4, M4A1, M4 |
 | | The M16 is a lightweight, 5.56 mm caliber, air-cooled, gas-operated, magazine-fed rifle, with a rotating bolt, actuated by direct impingement gas operation. |
 | | The bullet had to penetrate a standard U.S. steel helmet, body armor, or a 0.135 inch (3.4 mm) steel plate and retain a velocity in excess of the speed of sound at 500 yards (460 m), while equaling or exceeding the "wounding" ability of the.30 Carbine. |
 | | Their SS109 round was based on the U.S. cartridge but included a new bullet design with the same 5.56 mm caliber with a small steel tip to improve penetration. |
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