CMMG Lower Receiver Parts Kit - 223 Rem/556NATO - Black Finish - Includes Takedown Pin - Receiver Pivot Pin - Takedown Pin Detent (2) - Takedown Pin Detent Spring (2) - Hammer and Trigger Pin (2) - Hammer Spring - Trigger Spring - Disconnect - Disconnect Spring - Safety Selector - Selector Detent - Lock Washer - Pistol Grip Screw - Hammer - Trigger - Pistol Grip - Magazine Catch - Magazine Catch S