CMMG Banshee MK4 22 LR 9" AR-Platform Pistol, Armor Black, M-LOK Free-Float Handguard

The CMMG Banshee MK4 .22 LR AR-platform pistol brings affordable, high-volume shooting to your lower receiver without the commitment of a full rifle build. Built on an AR15-compatible platform, this 9-inch upper receiver pairs with any standard AR15 lower group, letting you swap calibers or dedicate a receiver to rimfire fun. Whether you're zeroing a new shooter, running steel challenges, or just putting rounds downrange on a budget, the Banshee delivers the ergonomics and modularity of an AR in a compact, lightweight package—all while keeping ammo costs in check.

The upper arrives complete and ready to shoot, bundled with a properly zeroed bolt carrier group, charging handle, dust cover, and flash hider. That means no guessing about fit or function—unbox it, attach it to your lower, and you're on the line. The billet aluminum receiver and M-LOK free-float handguard give you room to add optics, lights, or grips as your needs evolve. At 2.9 pounds and 17.4 inches overall, it's nimble enough for close-quarters work or a truck gun, yet still fully AR-standard in controls and takedown.

CMMG engineered the Banshee for reliability with a traditional blowback operation and a 1:16 twist barrel optimized for .22 LR ammo. The 1/2×28 threaded muzzle accepts standard suppressors, making it an ideal host for subsonic shooting. Finished in Armor Black Cerakote, it looks and handles like a serious platform—because it is one. The Banshee is the no-compromise way to add a .22 upper to your arsenal.

Key Features

• AR15-compatible upper receiver—works with any standard AR15 lower
• Complete upper group arrives zeroed and ready to attach
• Billet 6061-T6 aluminum receiver for durability and precision
• M-LOK free-float handguard for accessory mounting and accuracy
• Included ZEROED charging handle, dust cover, and flash hider
• Traditional blowback operation optimized for .22 LR reliability
• 1/2×28 threaded muzzle for suppressor compatibility
• Lightweight at 2.9 lbs, compact at 17.4" overall length
• Armor Black Cerakote finish

Specifications

Frequently Asked Questions

Does the Banshee MK4 work with standard AR15 lowers?

Yes. The Banshee upper receiver is fully AR15-compatible and will attach to any standard AR15 lower group. This gives you flexibility to build a dedicated .22 upper or swap calibers on an existing lower.

What's included, and is it ready to shoot?

The Banshee arrives as a complete upper receiver group with bolt carrier group, charging handle, dust cover, and flash hider already installed and zeroed. Attach it to your lower, and you're ready to run.

Can I use a suppressor on the Banshee?

Yes. The barrel features a 1/2×28 threaded muzzle, which accepts standard suppressors. This makes it an excellent platform for subsonic .22 LR shooting.

What magazines does the Banshee use?

The Banshee is designed to work with CMMG .22 AR Conversion Mags.