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Building an AR-10 or LR-308 from a stripped lower means chasing down a long list of little springs, pins, and detents, and one missing buffer retainer can bring the whole project to a halt. The CMMG Zeroed Lower Parts Kit for the Mk3 308 solves that headache by packing all the small stuff into a single kit, so you can go from bare receiver to a finished lower in one sitting.
Every piece is made in the USA and built to meet or exceed mil-spec, which matters on a .308 platform where fit and function carry a bit more force than a standard AR-15. The parts show up sorted into color-coded packets, so instead of dumping a bag of hardware onto your bench and squinting at look-alike springs, you can work through the install in order and know exactly what goes where.
This is a complete kit, not a stripped-down builder's version. You get the Zeroed extended bolt catch with plunger, spring, and screw-in pin, the full fire control group with trigger, hammer, disconnector, springs, and retaining pins, the Zeroed magazine catch with extended release button and spring, Mk3 HD pivot and takedown pins with detents and springs, the buffer retainer and spring, and the Zeroed A2-style pistol grip with screw and washer.
The standout here is the Zeroed 60-degree/90-degree adjustable ambidextrous safety selector, detent, and spring. The dual throw lets you set it up short and fast or run the standard sweep, and lefties finally get a controls setup that works without extra parts. Keep in mind not all .308 lowers share the same spec. This kit is built for CMMG Mk3 lowers and Gen 1 DPMS high-pattern LR-308 receivers, and it drops into a lot of common AR-10 lowers as well, so it's worth confirming your receiver's pattern before you start. All parts wear a matching black finish to blend into just about any build.
It's designed for CMMG Mk3 receivers and Gen 1 DPMS high-pattern LR-308 lowers, and it drops into many other common AR-10 style lowers too. Because .308 lowers aren't all cut to the same spec, it's smart to confirm your receiver's pattern before ordering. If your lower is DPMS high-pattern based, you're usually in good shape.
It's a complete lower parts kit, so the full fire control group is included: trigger, hammer, disconnector, all the springs, and the retaining pins. That said, plenty of builders swap in an aftermarket two-stage trigger and simply set the included fire control group aside. Either way, you have a working trigger right out of the packets.
The Zeroed selector offers both a 60-degree and 90-degree throw, so you can run a shorter, faster sweep or the standard 90-degree movement. It also gives left-handed builders a proper ambi setup without hunting down extra parts. It's a feature you don't often find bundled into a lower parts kit.
CMMG separates the components into color-coded packets so you're not sorting through a pile of similar-looking springs and detents. It keeps the install organized and cuts down on the small mistakes that slow down a first-time build. It's a small thing that makes assembly go a lot smoother.
| UPC | 810097502321 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 38CA62B |
| Model | |
| Product Type | Lower Parts Kit |
| Color | Black |
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