MPN: 99B80E4-AB


  • Compact Action-Direct Impingement System operates without the need for a buffer and buffer tube
  • Caliber: 9mm
  • Finish: Armor Black Cerakote
  • Upper Receiver: CMMG 9mm Dissent Side Charger Upper Receiver - 7075-T6 Aluminum
  • Handguard: 9.6-Inch CMMG Proprietary Handguard
  • Muzzle Device: CMMG 9mm ZEROED Linear Compensator
  • Barrel: 10.5" 1:10 Salt Bath Nitrided 4140 Chrome Moly Steel
  • Muzzle Thread Pattern: 1/2"-28
  • Bolt Carrier Group: Dissent Side Charging Bolt
  • Charging Handle: CMMG Dissent Side Charging Handle (Left)
  • HP and MPI Tested

*This upper receiver assembly has a barrel that is shorter than 16". This upper is only for use on AR pistol lower receivers and NFA registered Short-Barreled Rifle (SBR) lower receivers. All NFA laws apply!


  • Weight: ~3.9 lbs.
  • Length: ~19"


  • CMMG Mk4 lower receiver
  • AR-15 lower receiver with CMMG 9AR conversion mags


  • 1x CMMG Dissent 9mm 10.5" Complete Side Charging Upper
  • 1x CMMG Dissent Side Charging Bolt
  • 1x 1913 Picatinny Rail End Plate


Pistol caliber carbines and PDWs have become quite popular recently. They are great for personal defense and offer a much more cost-effective alternative to rifles when it comes to recreational shooting at the range.

If you want to build a reliable and modern AR-style 9mm carbine, you should check out the complete upper assemblies made by CMMG. Here is the CMMG Dissent 9mm complete upper with a 10.5-inch short barrel.

Unmatched Shooting Experience

Crafted from resilient 4140 Chrome Moly Steel, the barrel boasts enhanced corrosion resistance and superior heat dissipation capabilities. The barrel is extremely durable, and with its 1:10 twist rifling, it is designed to be accurate as well. The barrel on this upper assembly is also threaded with a standard 1/2"-28 thread pitch, and it comes equipped with the CMMG 9mm ZEROED Linear Compensator, which helps in recoil mitigation and decreases muzzle rise for a smooth shooting experience.

Moving on, this upper assembly comes with a 9.6-inch Modular handguard. This proprietary handguard from CMMG has lightweight but durable aluminum construction, and it features M-Lok slots on both sides, with a continuous Picatinny rail on top.

Compact and Feature-Packed

One standout characteristic of this upper assembly is its compact action, cleverly designed to accommodate the recoil spring within the receiver itself. This ingenious configuration eliminates the need for a buffer tube altogether. This means that you could install a folding stock or brace to your firearm with the proper paperwork. Additionally, this upper assembly features a side charging handle instead of the traditional rear charging handle common on AR-style rifles, improving ergonomics and shooting experience.

This upper assembly also includes the Dissent Side Charging Bolt carrier group, which along with other components has been HPT and MPI tested to ensure the best quality and durability.

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  • This Item: CMMG Dissent 9mm 10.5" Complete Side Charging Upper
    MSRP: $1,499.95
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