CMMG Banshee 9mm Luger 5" AR-Platform Pistol, Armor Black, M-Lok Free-Float Handguard

The CMMG Banshee 9mm Luger 5" AR-Platform Pistol is a purpose-built short-barrel AR platform designed for shooters who want a compact, modular 9mm solution without compromise. Built on CMMG's proven radial delayed blowback operating system, the Banshee delivers reliable, soft-shooting performance in a package that's easy to configure and customize. Whether you're setting up a truck gun, a close-quarters training platform, or exploring 9mm AR building, this Armor Black pistol gives you the engineering and modularity AR enthusiasts demand.

What sets the Banshee apart is its thoughtful specification and feature set. The 5-inch 4140CM chromoly barrel (1:10 twist) is topped with a CMMG ZEROED Linear Compensator (1/2 x 28 thread) that tames recoil and mitigates muzzle rise. The billet 6061-T6 aluminum upper receiver pairs with an M-LOK free-float handguard, giving you real estate for mounting lights, lasers, or other gear without handguard sag. The ambi charging handle is accessible from either side, and every Banshee ships zeroed—bolt carrier group, dust cover, and compensator already tuned and tested by CMMG before it reaches you.

At 2.6 lbs and just 13.7 inches overall, the Banshee balances shootability with genuine portability. The 9mm platform plays nicely with standard AR15/Mk4 lowers and is compatible with multiple magazine ecosystems—run Colt-pattern mags (Mk9 platform), Glock-pattern mags (MkGs platform), or Sig P320 mags (Mk17 platform)—giving you flexibility to standardize across your firearms or adapt to what you have on hand. The Armor Black Cerakote finish handles hard use and stays looking sharp in the field or on the range.

This is a complete upper and lower ready to shoot, with no guesswork about bolt carriers or compatibility. CMMG's engineering focus on compact 9mm AR platforms means you're getting thoughtful design, not a compromise. If you're serious about 9mm AR pistols and want a no-fuss, feature-rich package that runs hard, the Banshee belongs on your short list.

Key Features

• 5-inch 4140CM barrel with 1:10 twist for reliable 9mm performance
• Radial delayed blowback operating system—soft shooting, easy to control
• CMMG ZEROED Linear Compensator included and pre-zeroed for immediate use
• M-LOK free-float handguard for unobstructed mounting of accessories
• Billet aluminum upper receiver (6061-T6) for precision and durability
• Ambi charging handle accessible from either side
• Ships complete with bolt carrier group and dust cover—ready to pair with a lower and shoot
• Compatible with Colt, Glock, and Sig P320 magazine platforms via different lower options
• Armor Black Cerakote finish resists wear and corrosion
• Compact 13.7" overall length, 2.6 lbs weight for truck gun or PDW-style use

Specifications

Frequently Asked Questions

What lowers will work with the Banshee 9mm upper?

The Banshee is designed to pair with standard AR15/Mk4 lowers. CMMG offers Mk9 (Colt-pattern magazines), MkGs (Glock-pattern magazines), and Mk17 (Sig P320 magazines) lower options, so you can choose the magazine ecosystem that fits your setup. You can also use any compatible 9mm AR conversion magazine lower that accepts the upper.

Does the Banshee come ready to shoot out of the box?

The Banshee upper comes complete with a bolt carrier group, charging handle, dust cover, and linear compensator—all CMMG ZEROED and tested. You'll need to pair it with a compatible lower receiver to complete the firearm. Once assembled to a lower, you're ready to go to the range.

What magazine types does the Banshee support?

The Banshee upper itself is compatible with 9mm AR conversion magazines and works with standard AR15/Mk4 lowers. Magazine compatibility depends on which lower platform you choose: Mk9 for Colt-pattern mags, MkGs for Glock-pattern mags, or Mk17 for Sig P320 mags.

Is this a good platform for a truck gun or compact 9mm build?

Yes. At 13.7 inches overall and 2.6 lbs, the Banshee is genuinely compact without sacrificing usability. The 5-inch barrel, soft-shooting radial delayed blowback system, and integrated linear compensator make it well-suited to short-range, high-control applications. The M-LOK handguard and modular AR platform let you keep it light or add accessories as your mission demands.