Fully automatic means when you hold the trigger it keeps shooting until the magazine is empty. Semi automatic means every time you pull the trigger a round is discharged. Some AR-15 platform scary black guns allow you to choose between these settings, some dont because they are only semi automatic. As far as I am aware there is no burst setting on a stock AR-15 which would fall in between those options.
As a super liberal who happens to own a scary black gun (and several others) please stop making us look like idiots and learn the difference.
Select fire is a weapon that can do full auto and semi auto. In other words, colloquially a full auto rifle. No AR-15s for the civilian market today are select fire or burst fire. Buying a new select fire or full auto rifle has been extremely illegal at the federal level for literal decades, as would be turning your semiautomatic into a select fire (without heavy duty federal licensing at a minimum)
Lol I think you mean "sorry I misread." Imagine being that bad at context and blaming the writing. Sure I could've been more explicit but most people can handle a single ambiguous pronoun in a comment chain without writing a whole salty comment about how wrong one clearly contextually incorrect interpretation is. You're what's wrong with the liberal gun community.