The CMMG Banshee 9mm suppressed upper in Armor Black is a 6.5-inch upper group that comes with a ZEROED 36 suppressor (CMMG part no. 99B6833AB). Its Fixed Ejector Radial Delayed Blowback action is CMMG’s pistol-caliber system, paired here with a can that tucks inside the oversized Dad Bod M-LOK handguard. The barrel is 4140CM steel with a nitride finish and a 1:10 twist, threaded 1/2×28 for the suppressor. CMMG lists it for Mk4, MkGs and Mk17 lower receivers, one of the widest fits in its suppressed upper lineup. A ZEROED ambidextrous charging handle completes the group.

Key Specifications

• The chambering is 9mm, a cartridge that stays mild and quiet behind a suppressor.
• Barrel length is 6.5 inches, 4140CM steel with a nitride finish.
• The twist rate is 1:10, suited to common 9mm bullet weights.
• The included suppressor is a ZEROED 36 on a 1/2×28 muzzle thread.
• The operating system is Fixed Ejector Radial Delayed Blowback, CMMG’s pistol-caliber action.
• The upper receiver is a Mk4 PCC Fixed Ejector in 6061 T6 aluminum, under an 11-inch M-LOK handguard.
• The group weighs 4.0 pounds and measures 19.5 inches.

Frequently Asked Questions

Which lowers does it fit? CMMG lists its Mk4, MkGs and Mk17 lower receivers.

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

Can I mount accessories near the suppressor? CMMG says the 1.72-inch inner diameter clears most modern suppressors, but M-LOK accessories mounted in the slots directly around the tucked suppressor cut that clearance. CMMG cannot guarantee fit there and notes the M-LOK screws may need shortening, so verify clearance before use.

Buy the CMMG ZEROED Banshee 9mm Suppressed Upper Group, 6.5-Inch, Armor Black

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through CMMG‘s short-barrel lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer. An Armor Black 9mm upper with its suppressor already matched is the shortest path to a quiet pistol-caliber AR.