The Geissele Super 3 Gun (SD-3) trigger is a semi-automatic derivative of the two-stage Super Select-Fire (SSF) combat trigger that Geissele Automatics has developed for customers in the U.S. Special Operations Community. In semi-automatic mode, the SSF performs like a match-grade two-stage trigger that allows precise and accurate trigger control that is ideally suited for engaging demanding medium and long range targets.