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CMMG 9mm 5in Banshee Upper Group Receiver. If you're looking to build the most compact 9mm AR, this upper provides compact design and compatibility with standard AR-15/Mk4 lowers and 9mm conversion mags or our 9mm pistol magazine lower platforms: Mk9 (Colt-pattern mags), MkGs (Glock-pattern mags), Mk17 (Sig P320 mags). Package contents: CMMG 9mm 5in Banshee Upper Group Receiver.
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