Geissele Super Dynamic 3Gun Trigger in Slow Motion Posted August 18, 2014 in AR-15, Companies by Nicholas C with 7 CommentsTags: 5.56 NATO, Geissele Alan Lardieri uses a cutaway AR lower and a high speed video camera to capture the full range of motion of the Geissele SD3G trigger. He shows it at 300, 600, 1200, and 2400 FPS.