AR-15 Survival parts kit. Mil-spec 5.56mm | .223 | 300 Blackout Includes: M16 Cam Pin (2) Carrier Key Screws Disconnect Disconnect Spring Ejector (2) Ejector/Selector Springs Ejector Roll Pin Extractor Extractor Spring and Buffer Extractor Pin Firing Pin Firing Pin Retainer (3) Gas Rings Hammer Spring Trigger Spring (2) Hammer/Trigger Pins Selector Detent Receiver Pivot Pin Takedown Pin (2) Takedown Pivot Pin Detents (2) Takedown Pivot Pin Springs **All Parts Meet or Exceed Mil-Spec**