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Q&A for CMMG Banshee Upper Receiver Group — 7 Questions & 6 Answers

Name CMMG Banshee Upper Receiver Group (5)
As Low As $828.99 Save Up to 14%
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Q
Jay, member, from NV, United States, asked on June 23, 2023

Does this 5.7, 5” upper come with any magazines?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on June 26, 2023

The CMMG Banshee Upper Receiver Groups do not come with magazines.

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Jason Bang, member, from WA, United States, asked on February 05, 2023

so this upper can shoot 9mm rounds right?

Expert Answer
A
Answered by Hunter, Gear Expert, from OH, United States, on November 13, 2023

The CMMG Banshee Upper Receiver Group models 99B518D-AB, 99B17FD-AB, and 99B518D-AB-DEMO are chambered in 9mm.

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Benjamin Hunter, member, from CA, United States, asked on October 09, 2022

Is this Upper compatible with a lower receiver equipped with Glock Magazines?

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A
Answered by Ethan, Gear Expert, from IL, United States, on October 17, 2022

9mm Uppers are designed to work with any standard AR15/Mk4 lower and 9mm AR Conversion Mags or CMMG 9mm pistol magazine lower platforms. Mk9 (Colt-pattern mags), MkGs (Glock-pattern mags), Mk17 (Sig P320 mags).

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Q
fabian20, guest, from AZ, United States, asked on July 19, 2022

Is this the complete Upper of the Mk57?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on July 29, 2022

Yes, the CMMG Banshee Upper Receiver Groups in 5.7x28mm are complete uppers that include the BCG and Charging handle.

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Ali, guest, from CA, United States, asked on May 05, 2022

Is the upper compatible with any AR 15 lower?

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A
Answered by Ethan, Gear Expert, from IL, United States, on May 13, 2022

The 9mm CMMG Banshee Upper Receiver Group is designed to work with any standard AR15/Mk4 lower and 9mm AR Conversion Mags or CMMG 9mm pistol magazine lower platforms: Mk9 (Colt-pattern mags), MkGs (Glock-pattern mags), Mk17 (Sig P320 mags). The 5.7x28mm upper receiver is compatible with either CMMG Mk57 lowers or a standard AR15/Mk4 lower (when used with CMMG 5.7 AR Conversion Mags).

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Kenny, guest, from AL, United States, asked on March 27, 2022

Does this come with the radial delayed bolt carrier group as well?

Expert Answer
A
Answered by Ethan, Gear Expert, from IL, United States, on June 01, 2022

Each CMMG Banshee Upper Receiver Group features the Radial Delayed Blowback Operating System and will include the bolt carrier group as well as a charging handle.

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Eddie, guest, from GA, United States, asked on October 24, 2025

Does this model have the fixed ejector?

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Having an account with OpticsPlanet.com makes writing questions and answers even better! We’ll save all of your questions and answers in your account, provide you easy access to them, so you can see how the community has responded.

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