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CMMG Mk4 6mm ARC Resolute Upper Group Receiver Up to 14% Off w/ Free S&H — 6 models

CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Coyote Tan, 60B1091-CT
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Midnight Bronze, 60B1091-MB
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Titanium, 60B1091-TI
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Tungsten, 60B1091-TNG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Sniper Grey, 60B1091-SG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Charcoal Green, 60B1091-CG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Coyote Tan, 60B1091-CT
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Midnight Bronze, 60B1091-MB
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Titanium, 60B1091-TI
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Tungsten, 60B1091-TNG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Sniper Grey, 60B1091-SG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Charcoal Green, 60B1091-CG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Coyote Tan, 60B1091-CT
1 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Coyote Tan, 60B1091-CT
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Midnight Bronze, 60B1091-MB
2 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Midnight Bronze, 60B1091-MB
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Titanium, 60B1091-TI
3 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Titanium, 60B1091-TI
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Tungsten, 60B1091-TNG
4 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Tungsten, 60B1091-TNG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Sniper Grey, 60B1091-SG
5 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Sniper Grey, 60B1091-SG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Charcoal Green, 60B1091-CG
6 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Charcoal Green, 60B1091-CG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Coyote Tan, 60B1091-CT
7 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Coyote Tan, 60B1091-CT
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Midnight Bronze, 60B1091-MB
8 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Midnight Bronze, 60B1091-MB
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Titanium, 60B1091-TI
9 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Titanium, 60B1091-TI
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Tungsten, 60B1091-TNG
10 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Tungsten, 60B1091-TNG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Sniper Grey, 60B1091-SG
11 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Sniper Grey, 60B1091-SG
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Charcoal Green, 60B1091-CG
12 of 12 images
CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Charcoal Green, 60B1091-CG

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Questions & Answers
This fits on a Milspec lower? Just need the Grendal mags? Correct?

Yes fits Mil-Spec lower and uses Grendel mags.

by Murphy, Verified Owner, July 31, 2025
Does this come with a complete bolt assembly and the charging handle? Expert Answer

Yes, the CMMG Mk4 6mm ARC Resolute Upper will include a BCG and charging handle.

by Ethan, Gear Expert, March 25, 2024
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6 Models Available
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ATTENTION! We currently do not ship this product to P.O. Boxes, AK, CA, CT, DE, HI, MA, NJ, NY, U.S. Territories, or select Colorado locations. Please see our policies for more information or a detailed list of locations.

Product Info for CMMG Mk4 6mm ARC Resolute Upper Group Receiver

Chambered in 6mm ARC, this RESOLUTE Upper Group is designed to pair with any standard AR15 pattern lower group. Harness the capability of 6mm in this uniquely designed RESOLUTE 16.1 upper.image

WARNING: California`s Proposition 65

Specifications for CMMG Mk4 6mm ARC Resolute Upper Group Receiver:

Manufacturer: CMMG
Caliber: 6mm ARC
Overall Length: 16.5 in
Barrel Profile: Medium Tapered
Gas System Length: Pistol Length
Barrel Twist Rate: 1-7.5
Muzzle Device: CMMG Zeroed Muzzle Brake
Fabric/Material: 7075 T6 Aluminum
Gas Block Journal Size-Diameter: .750 in
Gun Rail: M-LOK
Gun Type: Rifle
Gun Make: CMMG
Gun Model: CMMG Mk4
Weight: 3.9 lb
Magazine Included: No
Mount Type: M-LOK

Package Contents:

  • CMMG Mk4 6mm ARC Resolute Upper Group Receiver

What firearm models does the manufacturer say CMMG Mk4 6mm ARC Resolute Upper Group Receiver is compatible with?

The manufacturer suggests that CMMG Mk4 6mm ARC Resolute Upper Group Receiver is compatible with CMMG Mk4

CMMG Mk4 6mm ARC Resolute Upper Group Receiver Orderable Models

List of Orderable Models

  • CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Coyote Tan, 60B1091-CT , MPN: 60B1091-CT , UPC: 810097504684 , Code: 2CM-URC-CP51-60B1091-CT
  • CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Midnight Bronze, 60B1091-MB , MPN: 60B1091-MB , UPC: 810097504691 , Code: 2CM-URC-CP51-60B1091-MB
  • CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Tungsten, 60B1091-TNG , MPN: 60B1091-TNG , UPC: 810097504721 , Code: 2CM-URC-CP51-60B1091-TNG
  • CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Titanium, 60B1091-TI , MPN: 60B1091-TI , UPC: 810097504714 , Code: 2CM-URC-CP51-60B1091-TI
  • CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Sniper Grey, 60B1091-SG , MPN: 60B1091-SG , UPC: 810097504707 , Code: 2CM-URC-CP51-60B1091-SG
  • CMMG Mk4 6mm ARC Resolute Upper Group Receiver, 16.1in, Charcoal Green, 60B1091-CG , MPN: 60B1091-CG , UPC: 810097504677 , Code: 2CM-URC-CP51-60B1091-CG
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Last updated 2026-09-24 UTC.