USED CMMG ZEROED Lower Parts Kit AR15 55CA642. Every piece is made here in the USA and comes in convenient color-coded packets to make assembly a breeze. Check out our interactive install walkthrough video below or read the CMMG Resources LPK Install article for an in-depth breakdown. Dont forget a Buttstock or Brace kit to complete your pistol or rifle lower. All parts meet or exceed mil-spec. Specifications for CMMG AR-15 ZEROED Lower Parts Kit: Manufacturer: CMMG Gun Make: AR Platform Gun Model: AR-15 Package Contents: CMMG AR-15 ZEROED Lower Parts Kit ZEROED Extended Bolt Catch AR15 Bolt Catch Plunger Spring & Roll Pin ZEROED Trigger Guard Screw & Roll PIn Trigger & Trigger Spring Disconnector & Disconnector Spring Hammer & Hammer Spring Trigger/Hammer Retaining Pins ZEROED 60/90 Adjustable Ambi Safety Detent & Spring ZEROED Ambi Magazine Catch & Spring ZEROED Extended Magazine Release Button HD Pivot/Takedown Pins Detents & Springs ZEROED Pistol Grip Grip Screw & Washer Buffer Retainer & Spring CMMG 55CA642: ZEROED Lower Parts Kit AR15