Have a particular grip or trigger you want to use in your next AR10/LR-308 build? The CMMG ZEROED AR10 (Mk3/.308WIN) Gunbuilders 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. Specifications for CMMG Mk3 ZEROED Gunbuilder’s Lower Parts Kit: Manufacturer: CMMG Gun Make: CMMG Gun Model: CMMG Mk3 Condition: New Package Contents: CMMG Mk3 ZEROED Gunbuilder’s Lower Parts Kit ZEROED Extended Bolt Catch Mk3 Bolt Catch Plunger Spring & Screw Pin Trigger/Hammer Retaining Pins ZEROED 60/90 Adjustable Ambi Safety Detent & Spring ZEROED Ambi Magazine Catch & Spring ZEROED Magazine Release Button Mk3 HD Pivot/Takedown Pins Detents & Springs Buffer Retainer & Spring
6 reviews for CMMG Mk3 ZEROED Gunbuilder’s Lower Parts Kit
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Bubba –
Everything fits as they should. The saftey knobs are able to be set how you want them as in the angle. Very much would highly recommend. More than likely going to order a few more of these set ups for my next builds
Burnin Rubber –
Mil spec quality parts and the larger paddle bolt catch, ambi selector, and mag release are nice to have.
Doug Foote –
Dropped in like butter. Add a drop-in trigger and this bad boy is ready to rock.
J –
Bought this for an Aero M5 build, for those looking to do the same be aware that the bolt catch will not work with the aero upper like stated in other reviews, but also be aware that the pivot pin is slightly too large in diameter and slightly too short. This makes it a bit hard to remove without a tool, but it will work. The takedown pin works fine and is removable by hand. I used a Phase 5 ambi bolt catch/release and will be ordering a BAD takedown pin set and keeping these as spares. It also does not have the set screw for the takedown pin under the grip, but that can be picked up a the hardware store. Other than that its a decently made kit for my first AR10 build.
drcmcico –
DO NOT BUY FOR AN AERO PRECISION LOWER RECEIVER!!! I’m Building an AR-10, 308 and purchased the CMMG LPK for 308. My lower receiver is an Aero Precion brand and the bolt catch does not work, and the magazine release is barely long enough. Soooo disappointed because it looks great.
drcmcico –
Not for my aplication. CMMG lower kit will not fit on an Aero Precision 308 Lower. Do not waste your money or time!