CMMG Lower Receiver Assembly MK4/AR15 Midnight Bronze | 55CA102MB
Build your next custom AR-15 with confidence using the CMMG Lower Receiver Assembly MK4/AR15 in Midnight Bronze. Model 55CA102MB is a premium, mil-spec forged lower receiver finished in a striking Midnight Bronze Cerakote. Designed to meet or exceed military specifications, this complete lower receiver assembly provides a strong foundation for any MK4 or standard AR-15 build. Whether you’re assembling a competition rifle, home defense carbine, or a custom project, CMMG’s attention to detail and high-quality manufacturing ensure reliable function and a professional appearance.
Why Choose the CMMG MK4/AR15 Lower Receiver Assembly?
The CMMG Lower Receiver Assembly (55CA102MB) offers builders a high-quality, ready-to-use lower receiver with a factory-applied Midnight Bronze finish. Unlike raw or basic anodized lowers, this model comes pre-finished in a durable, corrosion-resistant Cerakote coating that provides both protection and a unique aesthetic. CMMG is known for producing precision-machined components that meet strict quality standards, making this lower receiver an excellent choice for builders who want reliability and visual appeal. The Midnight Bronze color offers a modern, tactical look that stands out from traditional black or flat dark earth finishes while maintaining a professional appearance.
Key Features of the CMMG MK4/AR15 Lower Receiver
- Midnight Bronze Cerakote Finish – Durable, corrosion-resistant, and visually striking.
- MK4 / AR15 Compatible – Works with standard AR-15 and MK4 pattern uppers and components.
- Forged Construction – Strong and reliable mil-spec forged aluminum receiver.
- Complete Assembly – Includes installed trigger guard and other small parts for convenience.
- Precision Machined – Tight tolerances for smooth function and easy assembly.
- Model Number: 55CA102MB
- UPC: 810097506497
Premium Midnight Bronze Cerakote Finish
The Midnight Bronze finish on this CMMG lower receiver is applied using high-quality Cerakote coating. This finish provides superior resistance to wear, corrosion, and harsh environmental conditions compared to standard anodizing. The deep bronze color gives the lower a distinctive, modern appearance that pairs well with a variety of upper receiver colors and accessories. Whether you’re building a custom rifle with matching components or simply want a unique look, the Midnight Bronze finish adds both protection and style to your build.
Compatible with MK4 and Standard AR-15 Platforms
The CMMG 55CA102MB is designed to work seamlessly with both CMMG’s MK4 platform and standard AR-15 components. This broad compatibility gives builders flexibility when selecting uppers, barrels, handguards, and other parts. The lower receiver is machined to mil-spec dimensions, ensuring proper fitment with a wide range of aftermarket parts and accessories. Whether you’re building a standard carbine or a more specialized rifle, this lower receiver provides a solid and reliable base.
Product Specifications – CMMG Lower Receiver Assembly
- Brand: CMMG
- Model: MK4/AR15 Lower Receiver Assembly
- Part Number: 55CA102MB
- Finish: Midnight Bronze Cerakote
- Material: Forged 7075-T6 Aluminum
- Compatibility: MK4 and Standard AR-15
- Includes: Installed trigger guard and small parts
- UPC: 810097506497
- Best For: Custom AR-15 builds, competition rifles, home defense builds
High-Quality Forged Construction
CMMG manufactures this lower receiver from high-strength 7075-T6 forged aluminum, the same material used in many military-grade firearms. This forging process creates a receiver with excellent structural integrity and resistance to stress. The precision machining ensures that all pin holes, magazine well, and other critical dimensions meet strict tolerances for smooth operation and easy assembly. Builders can expect consistent quality and reliable performance from this lower receiver assembly.
Why Builders Choose the CMMG Midnight Bronze Lower
The CMMG Lower Receiver Assembly MK4/AR15 Midnight Bronze (55CA102MB) is a popular choice among custom rifle builders who want both performance and aesthetics. The factory-applied Midnight Bronze Cerakote finish saves time and ensures a professional, even coating that would be difficult to achieve with home application. The complete assembly, which includes the trigger guard and other small parts already installed, makes the building process faster and more convenient. CMMG’s reputation for producing high-quality, American-made components gives builders confidence that this lower receiver will provide years of reliable service. Whether you’re building a competition rifle, a tactical carbine, or a unique custom project, the 55CA102MB offers the perfect combination of strength, style, and compatibility.
Start your next custom build with the CMMG Lower Receiver Assembly MK4/AR15 in Midnight Bronze (55CA102MB). This forged, mil-spec lower receiver features a durable Midnight Bronze Cerakote finish and is compatible with both MK4 and standard AR-15 platforms, making it an excellent foundation for any custom rifle project.
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