I just read this thread again. I am going to ask a very noobie question.
Is there a difference between a machine gun and a full auto? I noticed you referred to the belt fed as a machine gun, and then made an exclusionary statement. Is one category broader than the other meaning, are all machine guns full autos, but not all full autos are machine guns (kinda like how all apples are fruits, but not all fruits are apples)?
Are machine guns just referring to belt feds, but have maybe been bastardized to refer to all FA guns?
Is a magazine fed gun like an M16 a machine gun, or is it simply a full auto rifle?
Also, an MP5 is a submachine gun, so obviously it's a full auto. BUT is it also a machine gun?