Geissele MPX M4 Trigger. Derived from our CRANE Safety Certified M4 carbine trigger the Super Semi-Automatic (SSA) the Super MPX SSA delivers all of the same performance reliability safety and forgiveness features that the SSA possesses. The Super MPX is a non-adjustable two stage trigger that provides the shooter with precise and accurate trigger control. The trigger is light enough to be used in competition but is forgiving enough to be used in demanding applications such as close quarter battle (CQB) scenarios. These features make the Super MPX ideal for competition and target shooting applications and makes this a perfect trigger for your Sig MPX. Specifications for Geissele MPX M4 Trigger System: Manufacturer: Geissele Color: Black Trigger Pull Weight: 4.25 - 4.75 lb Trigger Pin Size: Mil-Spec Hand: Ambidextrous Gun Make: SIG Sauer Gun Model: SIG Sauer MPX AR-10 AR-15 Condition: New Type: 2 Stage Country of Origin: USA Package Contents: Geissele MPX M4 Trigger System What firearm models does the manufacturer say Geissele MPX M4 Trigger System is compatible with? The manufacturer says that Geissele MPX M4 Trigger System is compatible with AR-15 AR-10 SIG Sauer MPXGeissele 16-025: MPX M4 Trigger