Description
The CMMG MK47 Lower, M4 Butt Stock is a dedicated lower receiver assembly designed to build a rifle chambered in 7.62x39mm using standard AR-15 fire control groups and furniture, but with a reinforced, proprietary magazine well for reliable AK-pattern magazines. It comes with a standard M4-style collapsible buttstock installed, providing a familiar platform for a hard-hitting caliber. I’ve built a few of these, and they bridge the gap between the AR platform’s ergonomics and the 7.62×39’s punch in a way that just works.
Key Features
- Dedicated 7.62x39mm lower receiver with reinforced magazine well.
- Accepts reliable, steel AK-47 pattern magazines (like CMMG’s or surplus).
- Comes with a standard 6-position M4 collapsible stock installed.
- Uses mil-spec AR-15 buffer tubes, triggers, and pistol grips.
- Engineered to handle the increased bolt thrust of the 7.62×39 cartridge.
- Anodized finish for durability.
Specs & Details
| Specification | Detail |
|---|---|
| Caliber | 7.62x39mm |
| Magazine Compatibility | AK-47 pattern magazines |
| Stock | M4 Style, 6-Position Collapsible |
| Buffer System | Mil-Spec AR-15 Carbine |
| Fire Control Group | Accepts Standard AR-15 Triggers (not included) |
| Finish | Type III Hardcoat Anodized |
Here’s the thing—this isn’t just an AR-15 lower with a different magwell. CMMG designed the MK47 from the ground up to manage the specific pressures and feeding dynamics of the 7.62×39 round. The lower itself has a listed weight of about 2.5 lbs without other components, giving you a solid foundation. The real win is the magazine compatibility. You’re using proven, abundant AK mags, not finicky proprietary blocks or adapted AR mags that can be a headache. Pair this with a CMMG Mk47 upper or a compatible 7.62×39 AR upper, and you’re most of the way there. The price point of $476.76 reflects that this is a specialized, purpose-built component, not a generic lower.
Who This Lower Is For
This is for the shooter who wants the ergonomics and aftermarket support of the AR platform but desires the ballistic and economic profile of the 7.62x39mm cartridge. It’s perfect for builders looking for a reliable and fun range rifle, or a capable brush gun for hunting medium game in states where it’s legal. If you’ve ever been frustrated trying to make a standard AR lower run 7.62×39 smoothly, this is your solution. It’s also a great starting point for a unique SBR or pistol build, assuming you follow all NFA regulations.
Pros & Cons
Pros: Unlocks reliable 7.62×39 performance in an AR format. Uses tough, available AK magazines. Maintains full compatibility with most AR-15 parts except the upper receiver and bolt carrier group. The included M4 stock offers immediate adjustability. It’s essentially drop-in ready for your chosen LPK and compatible upper.
Cons: Requires a dedicated Mk47-style upper receiver and BCG; standard AR-15 uppers won’t work. The initial investment is higher than a standard AR lower. You’re committing to the 7.62×39 caliber ecosystem, though that’s the whole point.
Frequently Asked Questions
Q: Will this work with my existing AR-15 upper receiver?
A: No. You need a dedicated CMMG Mk47 upper receiver or a 7.62×39 AR upper specifically designed for use with the Mk47 lower’s magazine geometry and larger ejection port. Standard AR-15 uppers are not compatible.
Q: What magazines does it use?
A: It uses standard, unmodified AK-47 pattern magazines. CMMG produces their own excellent stainless steel mags for it, but most quality steel or polymer AK mags will function. This is a huge advantage over adapter-based systems.
Q: Is this considered a firearm?
A: Yes, the lower receiver is the serialized part legally defined as a firearm. Purchasing it requires an FFL transfer, just like any other lower. We can ship it to your local dealer for pickup.
Building on this platform is straightforward. You add a lower parts kit, your choice of trigger and pistol grip, then mate it with the correct upper. The result is a rifle that feels like home to any AR shooter but delivers a different kind of authority downrange. This complete lower assembly is available at firearms-missouri.com for Missouri residents and nationwide to compliant states. If you’re ready to build something that stands out from the sea of 5.56 rifles, this is a compelling place to start.
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