CMMG AR-15 Zeroed Lower Parts Kit Gunbuilder's 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. Kit Includes: Bolt Catch Plunger Spring & Roll Pin Trigger/Hammer