Generally, the difference between an automatic rifle and a machine gun comes down to weight and feed system; rifles, with their relatively light components (which overheat quickly) and small magazines, are incapable of sustained automatic fire in the way that machine guns are.
The difference between an automatic rifle and a machine gun comes down to weight and feed system. This is generally. Machine guns are. Rifles are incapable of sustained automatic fire in the way this. This was with their relatively light components (which overheat quickly). This was with small magazines.