Cmmg Lower Mk4/ar15 Blk
CMMG
$120.69
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CMMG
Cmmg Lower Mk4/ar15 Blk
The CMMG Mk4 AR-15 Stripped Lower Receiver delivers a precision-forged foundation for your next custom AR-15 build, combining mil-spec compatibility with CMMG's reputation for uncompromising quality and durability.
- Precision machined from forged 7075-T6 aluminum for maximum strength-to-weight ratio
- Cerakote Armor Black finish provides corrosion and wear resistance
- Fully mil-spec dimensions accept any standard AR-15 lower parts kit
- Chambered compatibility for .223 Remington and 5.56 NATO configurations
- Stripped design gives builders complete freedom over component selection
- CMMG's tight machining tolerances ensure a precise upper-to-lower fit
Who This Is For
This stripped lower receiver is ideal for AR-15 enthusiasts, hobbyist gunsmiths, and serious shooters who want to build a custom rifle from the ground up. Whether you're assembling your first AR-15 or adding to an existing collection, the CMMG Mk4 lower provides a reliable, mil-spec-compliant starting point that pairs with virtually any compatible upper receiver and parts kit on the market.
Specifications
| Brand | CMMG |
|---|---|
| Model | Mk4 Stripped Lower Receiver |
| Material | Forged 7075-T6 Aluminum |
| Finish | Cerakote Armor Black |
| Caliber Compatibility | .223 Remington / 5.56 NATO |
| Configuration | Stripped (No Parts Kit Included) |
| Mil-Spec Compliant | Yes |
| Platform | AR-15 |
| Category | Receivers / Frames |
Frequently Asked Questions
What parts do I need to complete this stripped lower receiver?
Because this is a stripped lower, it requires a complete lower parts kit (LPK) to become functional. A standard mil-spec AR-15 LPK includes the trigger group, hammer, safety selector, magazine catch, bolt catch, pistol grip, and all associated pins and springs. You will also need a buttstock or pistol brace assembly and a buffer tube kit. Any mil-spec compatible components will work with the CMMG Mk4 lower.
Will this lower receiver work with any AR-15 upper receiver?
Yes. The CMMG Mk4 stripped lower is machined to mil-spec dimensions, meaning it is compatible with the vast majority of standard AR-15 upper receivers on the market. Whether you're pairing it with a 5.56 NATO, .223 Wylde, or other compatible upper, the fit and function should meet mil-spec standards. Always confirm your upper's caliber compatibility before completing your build.
Is this lower receiver legal to purchase and build in California?
Purchasing a stripped lower receiver in California requires a standard firearm transfer through a licensed FFL dealer and compliance with California's assault weapon regulations. Any completed AR-15 build in California must conform to the state's "featureless" requirements or utilize a compliant magazine locking device. We strongly recommend consulting California's DOJ guidelines or a knowledgeable firearms professional before completing your build to ensure full legal compliance.
