The M16 is an assault rifle that was developed in 1963 by the United States that is select-fire, with a 20-round magazine. In 1969, the M16 replaced the M14 rifle as the standard service rifle of the US Military, and in 2010 it was replaced by the M4 carbine. The M16 has seen service in many Western Bloc countries since its development, and it was produced over 8,000,000 times.