Finish your next AR15 lower receiver with the CMMG® ZEROED™ Mk4/AR15 lower parts kit. 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. 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 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
