Have a particular grip or trigger you want to use in your next AR10/LR-308 build? The CMMGZEROED(TM) AR10 (Mk3/.308WIN) Gunbuilder's Kit includes the essential parts except the most commonly upgraded ones like: 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. Not all .308 lowers are the same. Our kit is designed to work with our lowers (Gen 1 DPMS High-Pattern LR-308) and meet or exceed mil-spec. We would recommend checking with the manufacturer of your lower for compatibility of parts if you are not using our receiver.Kit Includes:ZEROED Extended Bolt Catch Mk3Bolt Catch Plunger, Spring, & Screw PinTrigger/Hammer Retaining PinsZEROED 60deg/90deg Adjustable Ambi Safety, Detent, & SpringZEROED Ambi Magazine Catch & SpringZEROED Magazine Release ButtonMk3 HD Pivot/Takedown Pins, Detents, & SpringsBuffer Retainer & Spring