Semi-Auto: Fires 1 Shot for each trigger pull.
Auto-Response: Fires 1 Shot for each trigger pull or release.
Full Auto: Fires Repeatedly as long as the trigger is held.
3 Shot Burst: Fires 3 Shots for each trigger pull.
Turbo: Fires 1 shot for every trigger pull, fires 1 shot for every trigger pull or release if the time between trigger pulls is less than .25 seconds.