Is it a waste of ammo if its coming at you?
I can just imagine a firefight and a lib who decided he needed an AR complains against a gang shooting at him during a drive by, “You’re wasting ammo!”
Sustained, accurate fire is FAR more effective than inaccurate spraying. 3-round burst and full auto from a 30-round magazine can not be sustained and it is very inaccurate. Stick with the “Semi” position on the selector switch.