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CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver Up to 17% Off w/ Free Shipping — 5 models

CMMG UPPER GRP DIS MK4 5.56MM 10.5 ANOD BLK 9C6A7952, CMM55B8D86HCA
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Armor Black, 55B8D86-AB
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Tungsten, 55B8D86-TNG
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Coyote Tan, 55B8D86-CT
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Midnight Bronze, 55B8D86-MB
CMMG UPPER GRP DIS MK4 5.56MM 10.5 ANOD BLK 9C6A7952, CMM55B8D86HCA
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CMMG UPPER GRP DIS MK4 5.56MM 10.5 ANOD BLK 9C6A7952, CMM55B8D86HCA
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Armor Black, 55B8D86-AB
2 of 5 images
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Armor Black, 55B8D86-AB
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Tungsten, 55B8D86-TNG
3 of 5 images
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Tungsten, 55B8D86-TNG
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Coyote Tan, 55B8D86-CT
4 of 5 images
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Coyote Tan, 55B8D86-CT
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Midnight Bronze, 55B8D86-MB
5 of 5 images
CMMG DISSENT Upper Receiver, Mk4, 5.56x45mm NATO, 10.5in, 1-7 Twist, 1/2x28 Thread, Zeroed Blast Compensator, Midnight Bronze, 55B8D86-MB

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Questions & Answers
So to be clear. this does not require a traditional buffer system? i will be able to run it with a 1913 brace instead of the buffer tube and spring?

Yes. No buffer tube needed. More like a blowback ar9 or newer scar-h style charging handle and nothing towards the rear to move or rotate.

The charging handle doesn’t move once you’re locked and cocked. Really cool system and feels like a 22lr in recoil impulse compared to my ar15’s.

by Beev, Verified Owner, April 8, 2025
does it come with bolt carrier and charging handle Can you answer this question?
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Customer Reviews
Most Recent Reviews
can work with aero lower , but not fix for spike tactical lower. by Binh, Verified Owner, September 22, 2025
Work perfect on my aero lower receiver and 100% function.No issues no jam and very smooth after 300 rounds,love it so much.
Read 1 Review
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Product Info for CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver

Lets face it, the 6.5 DISSENT 5.56 is a ton of fun, and its rowdy! Now that we got that out of our system, our ears quit ringing, and we arent seeing fireballs anymore, we are able to bring the same patent pending compact action to even more people with the arrival of the 10.5 DISSENT. A longer barrel will give improved ballistics, while the DISSENTs compact platform still keeps this as a small, but powerful pistol to fill your needs.image

Its no secret that pistol stabilizing braces have been a target for scrutiny over the years, and those that enjoy building their own AR pistols have wondered what will come out of all the uncertainty. DISSENT is our answer. Utilizing our patent pending direct impingement Compact Action, DISSENT upper groups house the entire action and recoil assembly in the upper receiver resulting in less bulk and length than traditional AR pistols. The forward non-reciprocating side charger allows for quick bolt operation without coming off target.

DISSENT Upper groups include a 1913 Picatinny rail end plate to use in place of the lower receiver buffer tube.

Specifications for CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver:

Manufacturer: CMMG
Caliber: 5.56x45mm NATO
Barrel Length: 10.5 in
Barrel Twist Rate: 1-7
Threads per Inch: 1/2x28
Muzzle Device: Zeroed Linear Compensator
Fabric/Material: Aluminum
Gas Block Journal Size-Diameter: .750 in
Gun Rail: M-LOK
Gun Make: CMMG
Gun Model: CMMG Mk4
Condition: New
Magazine Included: No

Package Contents:

  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver

What firearm models does the manufacturer say CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver is compatible with?

The manufacturer says that CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver is compatible with CMMG Mk4

CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver Orderable Models

List of Orderable Models

  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Armor Black, 55B8D86-AB , MPN: 55B8D86-AB , UPC: 810097509276 , Code: 2CM-URC-DS5515-55B8D86-AB
  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Anodized Black, 55B8D86-HCA , MPN: 55B8D86-HCA , Code: 2CM-URC-DS5515-55B8D86-HCA
  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Tungsten, 55B8D86-TNG , MPN: 55B8D86-TNG , UPC: 810097509337 , Code: 2CM-URC-DS5515-55B8D86-TNG
  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Coyote Tan, 55B8D86-CT , MPN: 55B8D86-CT , UPC: 810097509290 , Code: 2CM-URC-DS5515-55B8D86-CT
  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Midnight Bronze, 55B8D86-MB , MPN: 55B8D86-MB , UPC: 810097509306 , Code: 2CM-URC-DS5515-55B8D86-MB

CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver Unavailable & Discontinued Models

List of Unorderable Models

  • USED, CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Anodized Black, 55B8D86-HCA , MPN: 55B8D86-HCA-EDEMO , Code: 2CM-URC-DS5515-55B8D86-HCA-EDEMO-RE-B
  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Sniper Grey, 55B8D86-SG , MPN: 55B8D86-SG , UPC: 810097509313 , Code: 2CM-URC-DS5515-55B8D86-SG
  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Charcoal Green, 55B8D86-CG , MPN: 55B8D86-CG , UPC: 810097509283 , Code: 2CM-URC-DS5515-55B8D86-CG
  • CMMG DISSENT Mk4, 5.56x45mm NATO, 10.5in Upper Receiver, 1-7 Twist, .750in, 1/2 X 28 TPI, Titanium, 55B8D86-TI , MPN: 55B8D86-TI , UPC: 810097509320 , Code: 2CM-URC-DS5515-55B8D86-TI
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