Geissele Super Mcx Ssa - M4 Curved Trigger Black . 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. Specifications for Geissele 05658 Super MCX SSA M4 Curved Bow AR Style Steel: Manufacturer: Geissele Color: Black Finish: Black/Silver Gun Make: AR Platform Additional Features: 4.5 lb Trigger Country of Origin: USA Package Content: Geissele Super MCX SSA AR Style M4 Curved Bow The Geissele 05658 Super MCX SSA M4 Curved Bow AR Style Steel 05-658 is a quality addition to the Geissele lineup. For more great deals on Rifle Triggers by Geissele please browse our Geissele Gun Parts page.