The CMMG Banshee Mk4 9mm Pistol 5" Threaded 30rd Tungsten is a compact AR-platform pistol that blends the familiar AR-15 ergonomics with the affordability and low recoil of 9mm. Built on CMMG’s proven Mk4 upper receiver and handguard, this pistol features a 5-inch threaded barrel and comes with one 30-round CMMG 9mm conversion magazine. It’s a ready-to-run pistol for range days, home defense, and training—no adapter needed.
| Manufacturer | CMMG |
|---|---|
| Model | Banshee Mk4 |
| Material | 7075-T6 aluminum upper and lower receiver (per manufacturer specs) |
| Compatibility | CMMG 9mm conversion magazines (included 30-round) |
| Finish | Tungsten Cerakote |
| Weight | 5.8 lbs (empty, per manufacturer) |
| Condition | New |
Key Features
- 5" Threaded Barrel — WHY IT MATTERS: A short barrel keeps the pistol compact for easy handling and storage, while the 1/2×28 threads let you attach a suppressor, compensator, or blast can to control recoil and noise.
- Direct Blowback Action with Radial Delayed Blowback — WHY IT MATTERS: CMMG’s patented radial delayed blowback system reduces bolt velocity and felt recoil compared to straight blowback 9mm ARs, making it smoother to shoot and easier to keep on target.
- Optics-Ready Upper — WHY IT MATTERS: The flat-top upper accepts any micro red dot or full-size optic without a gunsmith, so you can set up the perfect sight picture for your eyes and shooting style.
- Mk4 Handguard with M-LOK — WHY IT MATTERS: The free-float handguard gives you a solid mounting platform for lights, lasers, or a foregrip, while the slim profile fits smaller hands comfortably.
- Tungsten Cerakote Finish — WHY IT MATTERS: This durable, corrosion-resistant coating protects the aluminum from scratches and weather, and the tungsten color looks professional and low-profile.
Who It’s For
This pistol is built for the family shooter who wants an AR-style platform without the noise and muzzle blast of a rifle cartridge. It’s perfect for beginners learning the AR manual of arms with less recoil, for parents teaching teenagers safe firearm handling, and for anyone who wants a compact home-defense tool that’s easy to shoot and maintain.
Pros & Cons
- Pros: Reliable radial delayed blowback system, optics-ready, uses affordable 9mm ammunition, compact enough for vehicle or nightstand storage, Cerakote finish is tough and attractive.
- Cons: At 5.8 lbs it’s a bit heavier than some polymer-frame 9mm pistols. Also, the radial delayed blowback system requires a dedicated buffer and spring—you can’t swap in standard AR-15 parts without modifying.
Comparison
| Feature | CMMG Banshee Mk4 9mm | Zev Technologies AR9 | Agency Arms AR9 |
|---|---|---|---|
| Barrel Length | 5" threaded | 5.5" threaded | 5.25" threaded |
| Action Type | Radial delayed blowback | Straight blowback | Straight blowback |
| Weight (empty) | 5.8 lbs | 6.2 lbs | 5.9 lbs |
| Finish | Tungsten Cerakote | Black anodized | Black anodized |
| Magazine Compatibility | CMMG conversion mags | Glock mags | Glock mags |
| Price | $1,623.95 | $1,899.00 | $2,199.00 |
The CMMG Banshee offers a unique radial delayed action that reduces recoil better than the straight blowback of the Zev and Agency Arms models, while costing several hundred dollars less.
FAQ
Does this pistol come with a brace?
No, the CMMG Banshee Mk4 9mm Pistol is sold as a pistol with a bare buffer tube. You can add a pistol brace or arm brace of your choice, but it must comply with current ATF regulations.
What magazines work with this pistol?
It uses CMMG 9mm conversion magazines (included one 30-round magazine). These are specifically designed for the Banshee platform and are not compatible with standard Glock or Colt magazines.
Can I mount a suppressor on the threaded barrel?
Yes, the barrel is threaded 1/2×28, which is the standard size for 9mm suppressors. Just make sure your suppressor is rated for 9mm and that you follow all NFA regulations.
Is this pistol legal in my state?
We ship to all 50 states, but some states have laws regarding magazine capacity, threaded barrels, and pistol braces. Please check your local laws before ordering. We cannot ship restricted items to certain states.
How do I clean the radial delayed blowback system?
Clean it like a standard AR-15 bolt carrier group. The radial delayed system uses a rotating bolt head, so pay attention to the bolt lugs and the cam pin area. Use a quality CLP and a nylon brush. Per CMMG’s manual, avoid over-lubrication.
Ready to Order?
The CMMG Banshee Mk4 9mm Pistol 5" Threaded 30rd Tungsten is a smart choice for the family shooter who wants the AR platform in a manageable, affordable caliber. With its radial delayed action, compact size, and optics-ready design, it’s a versatile tool for training, home defense, and range fun.
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Browse more options in our AR Pistols collection, or check out our 9mm Uppers and Firearm Accessories.
Last updated: April 2026
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This CMMG Banshee Mk4 9mm Pistol 5″ Threaded 30rd Tungsten is ideal for shooters looking to buy guns online with confidence. Built with precision engineering and tested performance, it’s a top-tier choice whether you're looking for home defense, sport shooting, or a trusted everyday carry.
Why Choose the CMMG Banshee Mk4 9mm Pistol 5″ Threaded 30rd Tungsten?
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