CMMG Resolute 100 Upper Group MK4 5.56x45mm BCG Included M-Lok Handguard CMM55BC761

SKU: FLX-CMM55BC761

Vendor CMMG
Regular price $652.98
Sale price $652.98 Regular price
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CMMG Resolute 100 Upper Group MK4 5.56x45mm

The CMMG Resolute 100 Upper Group for the MK4 platform in 5.56x45mm is purpose-built for shooters who demand reliability and performance without compromise. Engineered as a complete upper group, it ships with the bolt carrier group (BCG) included, making it a ready-to-install solution for your MK4 lower receiver. The 16.1-inch barrel is crafted from 4140 Chrome Moly steel with a Salt Bath Nitride (SBN) finish, delivering outstanding corrosion resistance and long-term durability with a fast 1:7 twist rate optimized for stabilizing modern 5.56x45mm projectiles. The CMMG RML15 M-Lok handguard provides a slim, ergonomic profile along with ample attachment points for accessories, while the hard coat anodized finish on both the forged 7075-T6 aluminum receiver and handguard ensures lasting protection in the field or at the range. The Resolute 100 is the ideal foundation for a capable, no-nonsense AR-15-pattern rifle.

Product Highlights

  • Complete Upper Group with BCG Included: Ships ready to pair directly with a compatible lower receiver, saving time and ensuring proven compatibility.
  • 16.1" 4140 Chrome Moly Barrel with Salt Bath Nitride Finish: Provides exceptional durability, corrosion resistance, and consistent accuracy with a 1:7 twist rate.
  • CMMG RML15 M-Lok Handguard: A free-float M-Lok design that reduces overall weight while offering versatile and modular accessory mounting options.
  • Forged 7075-T6 Aluminum Receiver with Hard Coat Anodize: Delivers maximum structural strength and wear resistance for demanding use in any condition.
  • Mid-Length Gas System and A2 Compensator: Promotes smooth, reliable cycling and features a standard 1/2-28 threaded muzzle for aftermarket device upgrades.

Specifications

  • Brand: CMMG
  • MPN: CMM55BC761
  • UPC: 816422026562
  • Caliber: 5.56x45mm
  • Barrel Length: 16.1"
  • Barrel Twist: 1:7
  • Barrel Profile: Medium Taper
  • Barrel Material: 4140 Chrome Moly (4140CM)
  • Barrel Finish: Salt Bath Nitride (SBN)
  • Muzzle Device: A2 Comp, threaded 1/2-28
  • Gas Port Location: Mid Length
  • Receiver: Forged 7075-T6 Aluminum, M4 Type Upper, Complete with BCG
  • Handguard: CMMG RML15 M-Lok
  • Finish: Hard Coat Anodized (Receiver and Handguard)
  • Charging Handle: CMMG Mil-Spec
  • Weight: 4 lbs 5 oz
  • Overall Length: 25.2"

Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product's manufacturer.

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