After putting my first AR together, I figured out how the semi auto trigger works. That got me to wondering how the full auto and more specifically the 3 round burst trigger systems work. A little research on Youtube and I found a great video on how they work.
[video=youtube_share;cxwPEL8winI]http://youtu.be/cxwPEL8winI[/video]
[video=youtube_share;cxwPEL8winI]http://youtu.be/cxwPEL8winI[/video]