CMMG Zeroed AR-15 Gun Builder’s Lower Parts Kit

Customization is endless with the AR15 platform, which is why the CMMG ZEROED Mk4/AR15 Gunbuilder’s Kit includes all of the essential parts except the most commonly upgraded ones: Trigger Guard, Fire Control Group, and Pistol Grip. Check out our interactive install walkthrough video below or read the CMMG Resources LPK Install article for an in-depth breakdown. All parts meet or exceed mil-spec. All installation hardware included.

Includes:

• Bolt Catch Plunger, Spring, & Roll Pin
• Trigger/Hammer Retaining Pins
• ZEROED 60°/90° Adjustable Ambi Safety, Detent, & Spring
• ZEROED Ambi Magazine Catch & Spring
• ZEROED Magazine Release Button
• HD Pivot/Takedown Pins, Detents, & Springs
• Buffer Retainer & Spring