CMMG AR Parts Kit, Lower Spring and Pin Kit, Trigger Spring, Hammer Spring, 2 Hammer Trigger Pins, 2 Takedown Springs, Disconnector Spring, Safety Selector Detent/Spring, Bolt Catch Spring/Plunger/Coil Pin, Trigger Coil Pin, Buffer Retainer/Retainer Spring, Takedown Detent 55AFF75 Parts Kit" AR15" Lower Pins and Springs. All Parts Meet or Exceed Mil-Spec.