The Super MCX SSA was designed as a high performance, combat inspired two stage trigger. Derived from Geissele CRANE Safety Certified M4 carbine trigger, the Super Semi-Automatic (SSA), the Super MCX delivers all the same performance, reliability, safety and forgiveness features that the SSA possesses. The Super MCX is a 4.5lb, non-adjustable, two stage trigger that provides the shooter with precise and accurate trigger control.