The Geissele Super Dynamic - 3 Gun (SD-3G) trigger is a semi-automatic-only derivatice of the two-stage Super Select Fire (SSF) combat trigger that Geissele produces for customers in the U.S. Special Operations Community. The SD-3G was developed to combine the SSF combat trigger's match-grade semi-auto performance with its smooth single-stage full-auto feel to make a fast, smooth and robust trigger ideal for 3 Gun competition shooting.