This is a Schmid Tool trigger (OEM Packaged).

The Schmid Tool 2-stage trigger features a 4.5 lb total pull weight and a durable Nickel Boron finish, ensuring a smooth pull and crisp break every time you squeeze the trigger. The two stages of this trigger consist of an initial 2 lb pull that brings you to a “wall”, where the hammer and trigger are set to break for the shot. After that, it’s only a 2.5 lb pull to fire, helping you to make accurate shots with short resets in between.

Installation is quick and easy, with no gunsmithing required. The Schmid Tool 2-Stage Nickel Boron Trigger is compatible with most AR-15 and AR-10 platforms and is designed to meet or exceed MIL-SPEC standards for quality and reliability.