The Geissele Super Dynamic-Combat (SD-C) Trigger is a semi-auto only version of the select-fire trigger that Geissele makes for customers in the U.S. Special Operations community. The SD-C is a rugged, nonadjustable combat trigger with a sear design that provides a wide margin of safety against unintentional discharges yet still gives the operator a sharp, repeatable trigger release. The SD-C?s positive functioning and extreme reliability is ideally suited for weapons used in harsh, demanding environments such as Close Quarters Battle (CQB) and Squad Designated Marksman (SDM) applications.