This is a Apex Tactical Specialties Trigger, model 100-170.
The Apex Action Enhancement Trigger Kit for the M&P Shield 2.0 directly replaces the factory hinged trigger with a solid aluminum trigger body. The trigger reduces trigger pre-travel and over-travel by approximately 20%. It features a smooth face with a center mounted pivoting safety. The trigger is perfect for use with the Shield 2.0 already equipped with the Apex Duty/Carry Kit.
Features:
Reduces pre-travel
Reduces over-travel
Center mounted pivoting safety maintains factory safety values