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The CMMG MK4 stripped lower receiver is a precision-machined foundation for any AR-15 build. Forged from 7075-T6 aluminum and finished with durable Armor Black Cerakote, this receiver combines the strength and corrosion resistance you need in a lightweight platform. If you're looking to build custom without paying for pre-assembled parts you don't want, a stripped lower gives you full control over triggers, grips, and internal components.
The CMMG MK4 accepts standard mil-spec lower parts kits, which means compatibility is straightforward. The flared magazine well is built into the receiver to speed up magazine changes during use. Armor Black Cerakote provides excellent abrasion and corrosion resistance compared to traditional finishes, and it won't degrade from cleaning solvents or field handling. The receiver is marked for .223 Remington and 5.56 NATO compatibility.
Your stripped lower ships as just the receiver itself. To complete it, you'll need a mil-spec lower parts kit that includes the trigger group, selector, safety, magazine catch, and all the necessary springs and pins. From there, you'll add a buffer kit, stock or brace, and your choice of grip and trigger. The precision machining means tight tolerances and zero wobble when mated to a compatible upper receiver. Builders appreciate that forged 7075-T6 aluminum is nearly twice as strong as the 6061 alloy used in budget alternatives, so you get durability without excess weight.
CMMG backs every product with a lifetime quality guarantee against material and workmanship defects.
You'll need a mil-spec lower parts kit that includes the trigger group, springs, pins, and detents. You'll also want a buffer kit (buffer tube, buffer, spring, castle nut and end plate), a stock or brace, a pistol grip, and any trigger guard or safety upgrades you prefer. The upper receiver and magazines complete the rifle.
Yes, the MK4 stripped lower accepts any mil-spec AR-15 upper receiver. It's built to traditional mil-spec dimensions, so compatibility with most major brands is excellent. Some builders have reported flawless fitment and zero wobble when paired with quality uppers.
A flared magazine well acts as a funnel to guide magazines in more quickly and smoothly, especially helpful during rapid reloads or in low-light situations. It doesn't change the overall profile of the receiver, so you get the benefit without compromise.
Armor Black Cerakote is a ceramic-based coating engineered for abrasion and corrosion resistance. It withstands field handling, won't degrade from cleaning solvents, and provides durability comparable to professional military finishes. The coating is flexible enough to resist cracking if dented, unlike some harder finishes.
This lower is marked for .223 Remington and 5.56 NATO. While the lower itself doesn't determine caliber, you'll want to match your upper receiver to one of these cartridges for proper function and safety. Always ensure your upper and lower caliber markings align.
Yes, every CMMG product is backed by a Lifetime Quality Guarantee against material and workmanship defects. This gives you long-term confidence in your build foundation.
| UPC | 810097506466 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 55CA102-AB |
| Action | |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Armor Black |
| Model | |
| Product Type | Stripped |
| Shipping Weight | 0.745 |
| Style | Stripped |
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