The Geissele Super SCAR is designed similarly to the Geissele SSA. The Super SCAR is a 4.5lb. non-adjustable combat trigger that is a precision two-stage trigger and allows precise and accurate trigger control. The Super SCAR is designed to work with the factory FN polymer housing that is supplied with all SCAR16 and SCAR17 rifles. A Select-Fire version of this trigger is also available. The Geissele Super Scar trigger is designed to only fit into the standard polymer trigger housing manufactured by FN. We do not recommend installing the Geissele Super Scar trigger into any aftermarket trigger housing. We have seen dimensional discrepancies and safety interface issues in the aftermarket trigger housing that do not allow our triggers to function properly and can produce an unsafe situation.