CMMG ZEROED Lower Parts Kit AR15 "The Ultimate Upgrade"

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
• Buffer Retainer & Spring