All the parts you need to get started on you next AR15 build. Combine this kit with a buttstock kit to complete your lower group. Includes a CMMG ambi selector.Features:All parts meet or exceed Mil-SpecIncludes: Takedown Pin, Trigger Spring, Receiver Pivot Pin, Disconnect, (2) Takedown Pin Detent, Disconnect Spring, (2) Takedown Pin Detent Spring, Magazine Catch and Spring, Bolt Catch, Trigger Guard Assembly, Bolt Catch Plunger, Trigger Guard Pivot Spring Pin, Bolt Catch Spring, Selector Detent, Bolt Catch Spring Pin, Lock Washer, Buffer Retainer, Pistol Grip Screw, Buffer Retainer Spring, Hammer, (2) Hammer and Trigger Pin, Trigger, Hammer Spring, Pistol Grip, Ambidextrous Selector, Magazine Release Button