ZEROED Lower Parts Kit, AR15, 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.