Luth-AR Gunsmith Kit For AR-15 Includes Buffer Retainer (10) Buffer Retainer Spring (10) Bolt Catch Spring (5) Bolt Catch Buffer (5) Bolt Catch Roll Pin (5) Detent Spring (20) Takedown Detent (20) Front Pivot Pin (5) Disconnector (5) Trigger Spring (5) Pistol Grip Screw (3) Pistol Grip Screw Washer (3) Selector/Ejector Spring (10) Selector Detent (10) Hammer/Trigger Pin (10) Rear Takedown Pin (5) Disconnector Spring (5) Hammer Spring (5) Gas Tube Roll Pin (10) 223/556 Crush