History Of The M16 The M16 was first used in combat during the Vietnam War. True False None The M16 was based on the AR-15, which was originally designed by Eugene Stoner. True False None The first versions of the M16 had reliability issues due to the lack of a chrome-lined barrel and improper maintenance instructions. True False None The M16 has remained unchanged since its introduction in the 1960s. True False None The M16 is still the standard-issue rifle for the U.S. military. True False None Time's up Most Popular Most Popular