CMMG MK4 AR-15 Lower Receiver - 55CA102AB - Anodized Black
$97.83
$174.95
(You save
$77.12
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The CMMG MK4 AR-15 lower receiver is a precision-forged foundation for building a reliable, accurate rifle from the ground up. Machined from 7075 T6 aluminum and finished in Armor Black Cerakote, this mil-spec lower receiver delivers the durability and dimensional accuracy you need to assemble a quality AR-15 or customize an existing platform. Whether you're a first-time builder looking to put together your own rifle or an experienced gunsmith stocking options for future projects, a stripped lower receiver gives you complete control over the final build and lets you pair it with your choice of lower parts kits and upper assemblies.
CMMG has built a reputation for attention to detail in AR platform manufacturing, and the MK4 lower reflects that standard. The 7075 T6 aluminum forging starts from premium material and is machined to mil-spec tolerances, ensuring reliable function and longevity. The Armor Black Cerakote finish resists corrosion and wear, holding up to regular handling and field use without showing wear as quickly as anodize alone.
This is a stripped lower receiver—it comes without a fire control group, trigger assembly, or stock hardware—so you'll need a mil-spec lower parts kit to complete the build. That flexibility is the whole point: you choose the trigger, safety, buffer system, and controls to match your intended use, whether that's hunting, competition, home defense, or just putting rounds downrange at the range.
Key Features
- Precision-forged 7075 T6 aluminum construction for strength and reliability
- Mil-spec dimensions and tolerances for broad compatibility
- Armor Black Cerakote finish for corrosion resistance and durability
- Stripped configuration allows you to select your own lower parts kit and controls
- Ready for assembly with any standard mil-spec lower parts kit
Specifications
| Receiver Type | Stripped Lower Receiver |
| Platform | MK4 AR-15 |
| Material | Forged 7075 T6 Aluminum |
| Finish | Armor Black Cerakote |
| Compatibility | Mil-spec lower parts kits |
Frequently Asked Questions
What do I need to complete this lower receiver?
A mil-spec lower parts kit, which includes the fire control group, safety selectors, trigger, hammer, and related springs and pins. You'll also need an upper receiver assembly and stock/buffer tube setup to build a complete rifle.
Is this receiver compatible with standard AR-15 upper assemblies?
Yes. The CMMG MK4 lower receiver is machined to mil-spec dimensions and will work with any mil-spec AR-15 upper receiver.
What finish does it come with?
The receiver is finished in Armor Black Cerakote, a durable ceramic-based coating that resists corrosion and scratching better than standard anodize.
Can I use this lower receiver to build an AR pistol or SBR?
This is a stripped lower receiver with no serialization restrictions as a component. Consult federal, state, and local laws regarding AR pistols and short-barreled rifles in your jurisdiction before completing your build.
Firearm Shipments:
To buy rifles or shotguns, you must be 18 years old, and for handguns, actions, or receivers, the minimum age is 21. By placing an order for this firearm, you confirm that you are the legitimate transferee/buyer, meet the legal age requirements, and comply with all Federal, State, and local laws and regulations necessary to purchase this firearm.
We only ship firearms to valid Federal Firearms License (FFL) holders. At checkout we provide a FFL locator for your convenience.
We will need a copy of the FFL’s license to facilitate the process, kindly request your dealer to email us a copy of their FFL, as we cannot dispatch the firearm until we receive this document. It is imperative for the buyer to choose their FFL dealer, ensure they are willing to facilitate the transfer, and have them email their FFL copy to BOSQUE Outdoors. To avoid any confusion, the customer's name or order number must be mentioned in the email containing the FFL.
Email: [email protected]
- Prior to placing an order, it is the buyer's responsibility to understand and adhere to their state's firearm regulations.
- The buyer should verify with their receiving dealer that the chosen firearm is legally permissible in their state.
- The buyer is accountable for any transfer fees or background check charges imposed by the receiving dealer. If the designated dealer declines to accept the firearm delivery, the buyer assumes responsibility for shipping costs to retrieve the firearm and resend it to an accommodating dealer.
- Handguns will be shipped using air transportation, while long guns can be shipped using ground methods. If your order includes a mix of firearm and non-firearm items, BOSQUE Outdoors will send the firearm(s) to your selected FFL dealer and the remaining non-firearm items to your billing address.
- Firearms cannot be returned to BOSQUE Outdoors; please contact the manufacturer for warranty claims.
- Firearms refused by the FFL Dealer or which cannot be transferred due to a failed background check are subject to a $75 restocking fee plus 10% of the purchase price.
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