This CMMG Zeroed Enhanced Lower Receiver Parts Kit includes everything needed to build a complete a lower receiver, less a stock assembly and stripped lower receiver of your choice. Every piece comes in convenient color-coded packets to make assembly a breeze. Don't forget a Buttstock or Brace kit to complete your pistol or rifle lower. All parts meet or exceed mil-spec. All installation hardware included. Kit Includes:ZEROED Extended Bolt Catch AR15Bolt Catch Plunger, Spring, & Roll PinZEROED Trigger Guard, Screw, & Roll PInTrigger & Trigger SpringDisconnector & Disconnector SpringHammer & Hammer SpringTrigger/Hammer Retaining PinsZEROED 60Adeg/90Adeg Adjustable Ambi Safety, Detent, & SpringZEROED Ambi Magazine Catch & SpringZEROED Extended Magazine Release ButtonHD Pivot/Takedown Pins, Detents, & SpringsZEROED Pistol Grip, Grip Screw, & WasherBuffer Retainer & Spring