It actually depends on the specific model you're talking about; the M16A2 has 3-round burst, but the way it operates depends on a rotating cam. This means you can have it SET on "burst", but release the trigger early, and the rifle will fire only one or two rounds out of that burst. Then, when you go to fire the NEXT burst, you will squeeze the trigger expecting a full three rounds, but you'll only get the remaining 1 or 2 rounds from the previous burst. Different designs have different methods of achieving a burst, though.
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