CMMG Dissent MK4 5.56 Upper, 10.5″, M-LOK, Zeroed Comp, Armor

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CMMG 55B8D86AB Dissent MK4 5.56x45mm NATO 10.50″, Left Side Charging Handle, Armor Black, Zeroed Blast Comp, 9.60″ M-LOK Handguard, Picatinny End Plate, Fits AR-Platform *UPPER ONLY

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 CMMG’s answer. Utilizing CMMG’s patent pending Compact Action and Radial Delayed Blowback technology with fixed ejector, DISSENT upper group houses 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.

$1,177.99

4 in stock

Purchase & earn 1,178 points!

CMMG Dissent MK4 5.56 NATO Upper – 10.5″ | Built to Perform, Ready to Drop In

Looking to upgrade your AR build with a compact, mission-ready upper? The CMMG 55B8D86AB Dissent MK4 Upper brings next-level innovation to the table—perfect for tactical dads who demand performance, control, and rugged reliability 🔥.

This isn’t your average upper. Chambered in 5.56x45mm NATO, it features a 10.5″ barrel that keeps things compact without compromising on accuracy. The left-side non-reciprocating charging handle puts controls exactly where you want them—quick, intuitive, and always accessible.

Finished in durable Armor Black, this upper isn’t just built to perform—it looks sharp doing it. The Zeroed Blast Comp effectively directs muzzle gases forward, reducing felt recoil and muzzle rise 💥—ideal for tight quarters or suppressed setups.

Highlights:

  • ⚙️ 10.5″ 5.56 NATO Barrel
  • 🔄 Left-Side Charging Handle (Non-Reciprocating)
  • 🛡️ Armor Black Finish
  • 🧱 9.60″ M-LOK Free-Float Handguard – Customize your loadout
  • ⬛ Picatinny End Plate – Ready for brace or stock installs
  • 💣 Zeroed Blast Comp – Tame that muzzle rise

Compatible with any standard AR-15 lower, the Dissent MK4 Upper is the perfect solution for your next pistol or SBR build. Whether you’re hitting the range, prepping for home defense, or just want the slickest upper on the block—this is the upgrade your rifle deserves.

🔧 Built tough. Runs smooth. Looks mean.

Add the CMMG Dissent MK4 Upper to your cart and own the upper game.

UPC

810097509276
Manufacturer

CMMG
Manufacturer Part Number

55B8D86AB
Rate of Twist

1:7"
Caliber/Gauge

.223 REM/5.56 NATO
Barrel Length

10.50"
Barrel Finish

Black

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