KAK Industry AR15 LPK Missing Parts Kit. Keep a set on hand for friends and emergencies. Package Contents: KAK Industry AR-15 LPK Missing Parts Kit Buffer Retainer - 1 Each Takedown / Pivot Pin Detent - 4 Each Selector Detent - 2 Each Selector / Ejector Detent Spring - 2 Each Disconnector Spring - 2 Each Takedown / Pivot Pin Detent Spring - 6 Each Buffer Retainer Spring - 1 Each Bolt Catch Spring - 2 Each Bolt Catch Detent - 1 Each KAK Industry AR15-LP-KT-04: AR15 LPK Missing Parts Kit