Most gun designs that included N-round burst have eventually abandoned it because full auto with operator in control of burst length turns out to be superior, w

Most gun designs that included N-round burst have eventually abandoned it because full auto with operator in control of burst length turns out to be superior, while at the same time the mechanism needed to force the burst is an extra point of failure and negatively affects trigger pull . Most recently, it was Russia dropping 2-round burst on AK-12 after experience with it in Ukraine. M4 is another famous historical example.