This is a Geissele Automatics Trigger known as the Super SCAR, model 05-157.
The Geissele Super SCAR is designed similarly to the Geissele SSA. The Super SCAR is a 4.0lb. non-adjustable combat trigger that is a precision two-stage trigger and allows precise and accurate trigger control.
Features:
TYPE: 2 Stage 1st Stage Weight: 2.5lbs.2nd Stage Weight: 1.5lbs.Total Pull Weight: 4.0lbs.