Who invented the M4 Carbine?
The M4 is a shorter version of the M16 rifle, which is the military designation of the Armalite Rifle. Eugene Stoner is generally credited with the creation of the Armalite.
How come the M4 carbine in CoD4 is fully auto isn't the m4 carbine the three round burst version of the M4A1?
Well, the lineage of the M4 goes back to the M16, which was designed in 1959. In the mid-1960s, a carbine version whose variants are universally known as the CAR-15 was designed, and that entered production in 1968. When the M16A2 entered service in 1983, a carbine version was soon developed, which became known as the M4. The first prototypes were finalised in 1984, and a limited number entered service in 1986.
An M4 is a military carbine that is a shorter varient of the M16 Assault Rifle, this carbine is shorter and lighter, allowing it to be highly adaptable in missions, this is why it is often used in special forces operations, in wich they are often modified with the SOPMOD (Special Operations Peculiar MODification).