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CMMG Dissent Mk4 6mm ARC 16.1in Upper Group 1-7.5 Twist 5/8 X 24 TPI .750in 25.5in Coyote Tan

CMMG Dissent Mk4 6mm ARC 16.1in Upper Group 1-7.5 Twist 5/8 X 24 TPI .750in 25.5in Coyote Tan

CMMG · Upper Receiver

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Best price

$1,299.00at OpticsPlanet

Out of stock Sale checked Oct 22, 2026

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Where to buy

StorePriceAvailabilityBuyAdd to build
OpticsPlanet $1,299.00Salechecked Oct 22, 2026 Out of stock Buy at OpticsPlanet

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Price history

Dashed line = out of stock. Tracking since Oct 13, 2026.

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Since Oct 13, 2026.

About this part

The CMMG Dissent Mk4 6mm ARC 16.1in Upper Group 1-7.5 Twist 5/8 X 24 TPI .750in 25.5in Coyote Tan is a 16.1" 6mm ARC upper receiver from CMMG. One store lists it, OpticsPlanet at $1,299.00.

Fits and works with

Caliber
6mm ARC · Shop matching ammo
Bolt
6.5 Grendel / 6mm ARC · Bolt carrier groups
Muzzle thread
5/8x24 · Muzzle devices
Barrel length
16.1" · Handguards

Specifications

Manufacturer
CMMG
Color
Coyote Tan
Platform
AR-15
Caliber
6mm ARC

From the manufacturer

CMMG Dissent Mk4 6mm ARC 16.1in Upper Group 1-7.5 Twist 5/8 X 24 TPI .750in 25.5in Coyote Tan. Combing the flat shooting characteristics of 6mm ARC with the revolutionary DISSENT Compact Action this upper group gives you the ability to build with a new AR15 lower or upgrade your existing DISSENT lower to an instrument with long-range proficiency. 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. Direct impingement DISSENTS come equipped with a left side charger standard. Right side charging handles for DI models are available here. All 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 6mm ARC 16.1in Upper Group: Manufacturer: CMMG Caliber: 6mm ARC Overall Length: 25.5 in Barrel Length: 16.1 in Barrel Twist Rate: 1-7.5 Firearms Threads Per Inch: 5/8x24 Muzzle Device: CMMG Zeroed Muzzle Brake Finish: Cerakote Fabric/Material: Aluminum Gas Block Journal Size-Diameter: .750 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: CMMG Weight: 5 lb Gas System Type: Direct Impingement Magazine Included: No Package Contents: CMMG Dissent Mk4 6mm ARC 16.1in Upper Group CMMG 60B2D0C-CT: Dissent Mk4 6mm ARC 16.1in Upper Group 1-7.5 Twist 5/8 X 24 TPI .750in 25.5in Coyote Tan

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$1,299.00 at OpticsPlanet
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