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Upper Group, Banshee 300, 9mm Radial Delayed Blowback


CMMG is temporarily halting the sale of complete firearms, upper receiver groups, lower receiver groups, and Radial Delayed Blowback BCG kits on our website in order to focus on outstanding orders. We apologize for the inconvenience and appreciate your patience as we traverse this extremely busy time. Sign up for notifications on your favorite products to get notified when they become available again or find a local dealer on our dealer page.

Upper Group, Banshee 300, 9mm Radial Delayed Blowback

If you want the best an AR has to offer, then the 300 Series is your choice. This AR upper group is fitted with every desired feature including a black hard coat anodized finish that can be upgraded to one of 10 premier Cerakote colors, a CMMG RML4 M-LOK handguard, CMMG ZEROED Ambi charging handle, and a 1/2-28 threaded barrel with thread protector. Chambered in 9mm, this upper group is ready for your next AR build.

9mm Radial Delayed Blowback uppers are designed to work with any mil-spec AR15 lower/CMMG Mk4 (when used with 9mm conversion magazines), as well as CMMG Mk9(Colt mag), MkGs(Glock mag), and Mk17(Sig P320 mag) lower groups. All upper groups come complete with BCG.

All CMMG products come with our Lifetime Quality Guarantee.

**All NFA rules apply** See linked CMMG Resource article for more information.

Technical Specifications

Platform MkGs
Caliber 9mm (Glock), 9mm, 9mm RDB
Operating System Radial Delayed Blowback
Barrel Length 5
Barrel Twist 1:10
Barrel Contour MT
Barrel Material 4140CM, SBN
Barrel Twist 1:10
Muzzle Device Thread Protector
Muzzle Thread 1/2"-28
Gas Port Location N/A
Gas Block N/A
Upper Receiver Forged 7075-T6 AL M4 type upper
Hand Guard CMMG RML4 M-LOK
Finish Hard Coat Anodized Receivers and Hand Guard (Can be upgraded to Cerakote)
Charging Handle CMMG ZEROED Ambi Charging Handle AR15
Weight 2.9

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