CMMG DISSENT Upper Group - MK4 5.56mm 6.5" Armor Black
The CMMG DISSENT Upper Group in Armor Black delivers exceptional performance in one of the most compact 5.56mm platforms available today. With a 6.5" barrel length, this upper group packs the full power of 5.56x45mm into a remarkably short package without sacrificing usability or ergonomics. Featuring CMMG's patent-pending direct impingement Compact Action, the entire action and recoil assembly is housed within the upper receiver, reducing bulk and overall length compared to traditional AR pistols. A forward non-reciprocating left-side charger allows the operator to charge the weapon without breaking their shooting position, while the 9.6" proprietary M-LOK handguard with a full-length top Picatinny rail provides ample accessory mounting locations. The durable Cerakote Armor Black finish offers excellent corrosion resistance, and the included 1913 Picatinny rail end cap replaces the standard lower receiver buffer tube for a more streamlined build. Every CMMG product is backed by a Lifetime Quality Guarantee against material and workmanship defects.
Product Highlights
- Ultra-Compact 5.56mm Platform: A 6.5" barrel makes this one of the shortest 5.56mm upper groups available, purpose-built for close-quarters pistol configurations.
- Patent-Pending Compact Action: Direct impingement design houses the complete action and recoil assembly inside the upper receiver, reducing overall bulk and length versus traditional AR pistol builds.
- Forward Non-Reciprocating Side Charger: Left-side charging handle enables the shooter to charge the weapon without coming off target, enhancing speed and control.
- Adjustable Gas Block: Allows precise tuning of the gas system for suppressed or unsuppressed shooting and optimizes performance for various ammunition types.
- 1913 Picatinny Rail End Cap Included: Replaces the standard lower receiver buffer tube, enabling flexible lower receiver compatibility and cleaner pistol builds.
Specifications
- Brand: CMMG
- Finish: Armor Black Cerakote
- Platform: MK4
- Caliber: 5.56x45mm
- Operating System: Compact Action - Direct Impingement
- Barrel Length: 6.5"
- Barrel Twist: 1:7
- Barrel Contour: MT
- Barrel Material: 4140CM, SBN
- Muzzle Device: CMMG ZEROED Blast Compensator
- Muzzle Thread: 1/2 x 28
- Gas Port Location: Pistol
- Gas Block: Adjustable .750"
- Upper Receiver: DISSENT 7075 T6 Aluminum
- Handguard: CMMG 9.6" Proprietary M-LOK
- Charging Handle: DISSENT Side Charger - Left
- Receiver Extension: 1913 Picatinny Rail End Cap
- UPC: 810097509344
- MPN: CMM55B9331AB
*NFA Rules May Apply: 6.5" DISSENT upper groups are designed for use in a pistol configuration. Using a pistol upper in conjunction with a stock or stabilizing brace on the lower receiver may classify your DISSENT as a Short-Barreled Rifle (SBR) and subject it to National Firearms Act (NFA) rules.
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