Who created the M-16?
The standard assault rifle for the US Armed Forces is the M16, the Marines first created the M16A4 the newest version of the M16, before 2011 the US Army were using the M16A3 but now they are adapting the M16A4. Although the M4A1 carbine is being used more by the US military now then the M16. In about 10 years the M4 is to be replaced.
Yes, the M16 assault rifle is older than the Colt Commando. The Commando was created in response to the armed forces wishing for a more compact version of the AR-15 pattern rifle for use by personnel not on the front lines. The M16 entered service in 1963 while development of the Commando did not start until 1965. It was dubbed the CAR-15 to establish the AR-15 as a Colt brand.
In a way the M16 is a machine gun, but it can also do three round burst and semi automatic. civilians are not allowed to have automatic m16s unless you have an automatic weapons permit, but you can have a semi automatic M16. (an AR-15 is almost like an M16 and much cheaper if you're looking to buy one.)