The Geissele Super MCX SSA Trigger was designed as a high performance, combat inspired two stage trigger. Derived from our CRANE Safety Certified M4 carbine trigger, the Super Semi-Automatic (SSA), the Super MCX delivers all of the same performance, reliability, safety and forgiveness features that the SSA possesses. The Super MCX is a non-adjustable, two stage trigger that provides the shooter with precise and accurate trigger control.