CMMG Banshee 9mm Luger 8" AR-Platform Pistol, Armor Black, M-Lok Free-Float Handguard

The CMMG Banshee 9mm Luger 8" AR-platform pistol brings the handling and ergonomics of the AR ecosystem to a compact, magazine-fed 9mm platform built for shooters who want rifle-like controls in a tight package. This complete upper receiver group pairs CMMG's radial delayed blowback operating system with an 8-inch barrel to deliver carbine-level velocity and accuracy in a form factor that excels for home defense, close-quarters training, and tactical drills where standard pistol-caliber rifles feel oversized.

Built on a billet 6061-T6 aluminum upper receiver with an M-LOK free-float handguard, the Banshee offers genuine modularity: it works with standard AR-15 lower receivers and 9mm conversion magazines, or you can pair it with CMMG's purpose-built 9mm lowers to run your choice of magazine platform—Colt, Glock, or Sig P320 patterns. That flexibility means you can build around the magazines you already own or standardize across your kit. The included ZEROED linear compensator tames recoil impulse, while the ambidextrous charging handle and polymer dust cover come ready to shoot right out of the box.

At 3 pounds and 16.5 inches in total length, the Banshee pistol remains nimble in vehicles, tight spaces, or slung across your body. The 1:10 barrel twist is optimized for 9mm projectiles, and the Armor Black Cerakote finish resists corrosion without the weight penalty of heavier coatings. Whether you're running it as a standalone pistol or planning a future lower swap, the Banshee upper delivers the reliability and adaptability CMMG is known for.

Key Features

• Radial delayed blowback operating system—proven, low-recoil design with minimal parts count
• Compatible with AR-15 lowers and multiple magazine platforms (standard 9mm conversions, Colt, Glock, or Sig P320 pattern lowers)
• M-LOK free-float handguard for accessory mounting and rail space without handguard sag
• Billet aluminum upper receiver for strength and precision
• 8-inch barrel optimized for 9mm ballistics and velocity in a compact envelope
• Includes ZEROED linear compensator, ambi charging handle, and dust cover—ready to shoot
• Armor Black Cerakote finish for corrosion resistance

Specifications

Frequently Asked Questions

What lower receivers is the CMMG Banshee 9mm upper compatible with?

The Banshee upper works with standard AR-15/Mk4 lower receivers using 9mm conversion magazines. CMMG also offers dedicated 9mm lowers: the Mk9 (for Colt-pattern magazines), MkGs (for Glock-pattern magazines), and Mk17 (for Sig P320 magazines). This flexibility lets you choose the magazine platform that fits your existing inventory or preferences.

Is this a complete upper group or does it require a lower?

This is a complete upper receiver group. It includes the bolt carrier group, charging handle, compensator, and dust cover. You'll need to pair it with an AR-15 compatible lower receiver to build a complete firearm.

What's included in the box?

The upper group comes ready to shoot with a ZEROED AR-15 polymer dust cover, ZEROED ambidextrous charging handle, and ZEROED linear compensator for 9mm already installed.

Why choose the 8-inch barrel length for 9mm?

The 8-inch barrel delivers solid velocity for 9mm while keeping the overall package compact and maneuverable—ideal for close-quarters use, home defense, and tactical training where a shorter profile matters without sacrificing ballistic performance.