<P> In 1964 , the M16 entered U.S. military service and the following year was deployed for jungle warfare operations during the Vietnam War . In 1969 , the M16A1 replaced the M14 rifle to become the U.S. military 's standard service rifle . The M16A1 improvements include a bolt - assist , chrome plated bore and a new 30 - round magazine . </P>
<P> In 1964 , the M16 entered U.S. military service and the following year was deployed for jungle warfare operations during the Vietnam War . In 1969 , the M16A1 replaced the M14 rifle to become the U.S. military 's standard service rifle . The M16A1 improvements include a bolt - assist , chrome plated bore and a new 30 - round magazine . </P>
when did the us military started using the m16
when did the us military started using the m16
1964
1964