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CMMG DISSENT Upper Receiver Mk4 300BLK 10.5in 1-7 Twist 5/8x24 Thread Zeroed Linear Compensator Tungsten

CMMG DISSENT Upper Receiver Mk4 300BLK 10.5in 1-7 Twist 5/8x24 Thread Zeroed Linear Compensator Tungsten

CMMG · Upper Receiver

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Best price

$1,199.00at OpticsPlanet

Out of stock Sale checked Oct 23, 2026

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Where to buy

StorePriceAvailabilityBuyAdd to build
OpticsPlanet $1,199.00Salechecked Oct 23, 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 Upper Receiver Mk4 300BLK 10.5in 1-7 Twist 5/8x24 Thread Zeroed Linear Compensator Tungsten is a 10.5" 300 Blackout upper receiver from CMMG. One store lists it, OpticsPlanet at $1,199.00.

Fits and works with

Caliber
300 Blackout · Shop matching ammo
Bolt
Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Muzzle thread
5/8x24 · Muzzle devices
Barrel length
10.5" · Handguards

Specifications

Manufacturer
CMMG
Color
Tungsten
Platform
AR-15
Caliber
300 Blackout

From the manufacturer

CMMG DISSENT Upper Receiver Mk4 300BLK 10.5in 1-7 Twist 5/8x24 Thread Zeroed Linear Compensator Tungsten. 5 300BLK DISSENT so we decided to take it and crank it up to 11... or how about 10.5? Giving you improved ballistics and an even more suppressor friendly length this all new length 300BLK upper is just the ticket to finish your 300BLK AR pistol build. 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 300BLK 10.5in Upper Receiver: Manufacturer: CMMG Caliber: .300 AAC Blackout Barrel Length: 10.5 in Barrel Twist Rate: 1-7 Firearms Threads Per Inch: 5/8x24 Muzzle Device: Zeroed Linear Compensator Finish: Cerakote Fabric/Material: Aluminum Gun Rail: M-LOK Gun Make: CMMG Gun Model: CMMG Mk4 Magazine Included: No Package Contents: CMMG DISSENT Mk4 300BLK 10.5in Upper Receiver What firearm models does the manufacturer say CMMG DISSENT Mk4 300BLK 10.5in Upper Receiver is compatible with? The manufacturer suggests that CMMG DISSENT Mk4 300BLK 10.5in Upper Receiver is compatible with CMMG Mk4CMMG 30BC239-TNG: DISSENT Upper Receiver Mk4 300BLK 10.5in 1-7 Twist 5/8x24 Thread Zeroed Linear Compensator Tungsten

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$1,199.00 at OpticsPlanet
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