Combining carbine-like ballistic performance and compact size this 8 BANSHEE upper group is what you need for the ultimate 9mm AR. Not only does this 9mm upper utilize CMMG’s RDB technology but shooters also have a number of lower/magazine pairing options. CMMG 9mm uppers work with standard AR15/Mk4 lowers and 9 AR Conversion Mags as well as a number of our pistol magazine lowers: Mk9 (Colt-pattern mags) MkGs (Glock-pattern mags) Mk17 (Sig P320 mags). Available in six 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 – Platform: Mk4 Mk9 Mk17 MkGs – Caliber: 9mm – Operating System: Radial Delayed Blowback – Barrel Length: 8 – Barrel Twist: 1:10 – Barrel Contour: MT – Barrel Material: 4140CM SBN – Muzzle Device: CMMG ZEROED Linear Compensator – Muzzle Thread: 1/2 x 28 – Upper Receiver: Billet 6061 T6 Aluminum – Hand Guard: CMMG EML7 M-LOK – Finish: Cerakote Standard – Charging Handle: CMMG ZEROED Ambi – Weight: 3.0 lbs – Length: 16.5