Gun Nutz Nickel Boron Fire Group Control TF AR-15 Two Stage Rifle Trigger - Finish your AR Build off with this two-stage trigger from Schmid Inside. This trigger has a Nickel Boron Finish (NIBB-X) for wear resistance with a smooth, crisp, and quick reset. Includes: Trigger Hammer Disconnect Hammer Spring Trigger Spring Disconnect Spring Hammer Pin Trigger Pin