Originally Posted By: Jim_
Originally Posted By: carp
If its either semi or full auto I still consider it a machine gun. The only difference is how you press the trigger.
No a semi won't do this;

an automatic gun that fires bullets in rapid succession for as long as the trigger is pressed.

My understanding from WiKI;

Auto fire - you press the trigger to fire and press again to stop.
semi auto - you press the trigger and you have to hold the trigger to continue to fire.

Simply - with full auto you fire and then your (hand) can be doing something else like re-loading and not be on the trigger like a semi.

Hence to me they are both machine guns - just trigger management is different.