CMMG Banshee 5" Upper Group - 9MM

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MSRP: $949.95
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CMMG Banshee 5" Upper Group - 9MM

The CMMG Banshee 5" AR Upper in 9MM is the pinnacle of design, engineering, and styling, tailor-made for those seeking to create the ultimate compact 9mm AR. This upper features CMMG's renowned Radial Delayed Blowback™ Operating System, initially developed for the .45 ACP MkG platform. Adapted across their pistol caliber lineup, it ensures softer recoil and reduced bolt weight compared to traditional straight blowback systems, enhancing user comfort and shooting experience. One of its distinguishing features is its versatility. It's designed to work seamlessly with any standard AR15/Mk4 lower, and it can accommodate 9mm AR Conversion Mags or CMMG's 9mm pistol magazine lower platforms: Mk9 (Colt-pattern mags), MkGs (Glock-pattern mags), Mk17 (Sig P320 mags). 

Available in different Cerakote finishes, all CMMG® Upper Groups come complete with bolt carrier group and ZEROED™ accessories including:

  • ZEROED AR15 Polymer Dust Cover
  • ZEROED AR15 Ambi Charging Handle
  • ZEROED Linear Compensator 9mm

Radial Delayed Blowback™ Operating System

Originally developed for the .45 ACP MkG platform, CMMG has adapted our Radial Delayed Blowback system across our pistol caliber lineup to create pistols and rifles with a softer recoil impulse and reduced bolt weight compared to traditional straight blowback systems.


  • Precise manufacturing
  • Long term reliability
  • Durable construction
  • 5" Barrel
  • 9mm
  • Complete upper assembly
  • Cerakoted Armor Black
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