CMMG Mk3 .308 Win Stripped Lower Receiver – Armor Black

Description

The CMMG Mk3 stripped lower gives you a rock-solid starting point for a .308 Winchester or 7.62×51 AR10 build. It's machined from forged 7075-T6 aluminum, the same aerospace-grade material you want at the heart of a large-frame rifle, then finished in Armor Black Cerakote for corrosion resistance and a clean, no-nonsense look that holds up to real range time. This is a stripped receiver, so you'll add your own lower parts kit, buffer tube, and stock to complete it exactly the way you want.

Why the Mk3 Lower Keeps Builds Simple

There's a lot of confusion in the .308 AR world because the platform was never standardized the way the AR15 was. CMMG cut through that by building the Mk3 around the DPMS LR308 Gen1 high-pattern design, which is the most common format out there. That means you get the widest selection of compatible barrels, handguards, and accessories, plus the receiver accepts LR308/SR-25 pattern magazines that are easy to find. It won't run FAL-style mags, so keep your feeding to the common SR-25 pattern and you're set.

Building Out Your Mk3 Stripped Lower

One of the nice surprises with this platform is its AR15-like modularity. You can finish it with a standard Mk3 Lower Parts Kit, step up to a Gunbuilder's Lower Parts Kit paired with a drop-in trigger, and even run the same pistol grips you'd use on an AR15. Pair it with a CMMG Mk3 upper for a guaranteed fit, since CMMG builds their uppers specifically to mate with Mk3 lowers. Other DPMS-pattern lowers may work with Mk3 uppers, but sticking within the CMMG Mk3 family takes the guesswork out.

Whether you're putting together a .308 hunting rig, a target gun, or a general-purpose semi-auto, this lower gives you a dependable foundation backed by CMMG's lifetime quality guarantee against material and workmanship defects.