CMMG 55BB40BAB Resolute MK4 5.56x45mm NATO 16.10", Armor Black, M-LOK Free-Float Handguard for AR-Platform (No BCG or Charging Handle)

Unleash your true potential in the field with the CMMG RESOLUTE MK4 5.56x45mm NATO Upper Receiver. Engineered for the discerning shooter, this upper group brings unparalleled reliability and performance to any AR-platform configuration. Imagine yourself confidently taking aim, knowing each round will deliver the accuracy and power required for every encounter. With its robust design and forward-thinking features, the RESOLUTE Mk4 is more than just an upper; it’s a statement of quality and craftsmanship that arms you with the best tools available.

This upper receiver exudes strength with its 16.1-inch barrel, constructed from 4140 chrome-moly steel and finished with a sleek Cerakote, ensuring both durability and style. The 1:7 twist and mid-length gas system are expertly tailored to optimize cycling and recoil management, allowing for steady follow-up shots and enhanced controllability. Whether you're at the shooting range or in the thick of a tactical situation, the superior performance of the CMMG RESOLUTE MK4 will elevate your shooting experience to new heights.

Equipped with an M-LOK free-float handguard, this upper receiver not only enhances accuracy but also ensures attachment flexibility for a variety of accessories—making it the ideal platform for customizing to your unique shooting style. The CMMG A2 flash hider minimizes muzzle flash, offering stealth when needed without sacrificing performance. This makes the RESOLUTE Mk4 perfect for both serious marksmen and recreational shooters seeking versatility and high-quality construction.

CMMG’s strict adherence to quality ensures that this assembled upper receiver is ready for any challenge. Enhance your collection with the RESOLUTE Mk4 and transform your AR into a pinnacle of modern firearm engineering. Your commitment to excellence deserves nothing less than the most reliable, effective, and striking upper receiver available on the market.

Key Features

• Engineered for optimal reliability and performance
• M-LOK free-float handguard for enhanced customization

Technical Specifications

What's in the Box

• CMMG RESOLUTE Mk4 Upper Receiver
• Assembly Manual

Compatibility & Requirements

• Compatible with standard AR-15 lower receivers

Dimensions & Weight