The CMMG 30AF20ACT Banshee Mk4 300 Blackout 30+1 8″ Black Nitride Threaded Barrel, M-LOK Handguard, Coyote Tan Cerakote Aluminum Receiver w/Picatinny Rail, Black Polymer CMMG RipBrace, CMMG Zeroed Grip is a compact, suppressor-ready AR pistol built for home defense and range fun. Chambered in .300 BLK, it delivers reliable cycling with both supersonic and subsonic ammunition right out of the box.
| Manufacturer | CMMG |
|---|---|
| Model | 30AF20ACT Banshee Mk4 |
| Material | 7075-T6 aluminum receiver, 4140 steel barrel |
| Compatibility | .300 Blackout, AR-15 lower parts (per manufacturer specs) |
| Finish | Coyote Tan Cerakote receiver, Black Nitride barrel |
| Weight | 5.8 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 8″ Black Nitride Threaded Barrel — This barrel is salt-bath nitrided for corrosion resistance and extended life. The 5/8×24 threads accept standard .30-caliber muzzle devices and suppressors easily.
- Coyote Tan Cerakote Aluminum Receiver with Picatinny Rail — The durable Cerakote finish resists scratches and wear, while the full-length top rail gives you plenty of real estate for optics, backup sights, or a red dot.
- CMMG RipBrace — This quick-deploy pistol brace uses a pull-and-twist mechanism so you can get a stable cheek weld in seconds. It’s comfortable for shooters of all sizes.
- CMMG Zeroed Grip — The grip angle promotes a natural wrist position, reducing fatigue during longer sessions. The texture is grippy without being abrasive.
- EML Handguard with Full-Length M-LOK Slots — The handguard has M-LOK slots on both sides and the bottom, plus M-LOK between the top Picatinny rail sections. You can mount lights, lasers, or hand stops exactly where you need them.
Who It’s For
This Banshee is a great choice for families who want a compact home-defense carbine that kids and adults can handle. The 8″ barrel keeps the overall length short, and the .300 BLK round is effective at typical indoor distances. It’s also ideal for new shooters moving up from a .22 LR who want a centerfire platform with less recoil than 5.56.
Seasoned shooters will appreciate the suppressor-ready barrel and the ability to run subsonic ammo without a gun modification. The RipBrace makes it legal as a pistol while still offering a stable shooting platform.
Pros & Cons
- Pro: Reliable cycling with both supersonic and subsonic .300 BLK — tested by CMMG with a wide range of ammunition.
- Pro: Compact enough to fit in a small safe or backpack, yet accurate to 150 yards with good optics.
- Con: The 8″ barrel means reduced velocity compared to a 16″ rifle, so long-range performance drops off past 200 yards. This is a trade-off for the compact size.
Comparison: CMMG 30AF20ACT vs. Zev Technologies OZ9 vs. Lone Wolf Distributors G19
| Feature | CMMG Banshee Mk4 | Zev Technologies OZ9 | Lone Wolf Distributors G19 |
|---|---|---|---|
| Caliber | .300 Blackout | 9mm | 9mm |
| Barrel Length | 8″ | 4.5″ | 4.0″ |
| Capacity | 30+1 | 17+1 | 15+1 |
| Suppressor Ready | Yes (threaded barrel) | Optional (threaded barrel extra) | Optional (threaded barrel extra) |
| Brace Included | Yes (RipBrace) | No (pistol only) | No (pistol only) |
| Price Range | ~$1,490 | ~$1,800 | ~$600 |
The CMMG offers a larger caliber and higher capacity than the Zev and Lone Wolf options, plus it comes ready for a suppressor and includes a brace. The Zev is a premium 9mm pistol with a modular chassis, while the Lone Wolf is a budget-friendly 9mm. Choose the CMMG if you want a compact rifle-caliber platform with a brace included.
FAQ
What is the overall length of the CMMG Banshee Mk4 with the RipBrace collapsed?
The overall length is approximately 26 inches with the brace fully collapsed and the 8″ barrel. This makes it easy to store in a vehicle or small safe.
Can I use standard AR-15 magazines with this .300 Blackout pistol?
Yes, it uses standard AR-15/M16 magazines. It comes with a 30-round Magpul PMAG, but any quality AR-15 mag will work fine.
Is the barrel threaded for a suppressor?
Yes, the 8″ Black Nitride barrel has 5/8×24 threads. You can attach most .30-caliber suppressors or a muzzle brake directly.
Does the RipBrace count as a stock for legal purposes?
No, the RipBrace is a pistol brace, not a stock. As long as you do not modify it to act as a stock, the firearm remains a pistol under current ATF guidelines.
What is the twist rate of the barrel?
The barrel has a 1:7 twist rate, which stabilizes both 110-grain supersonic and 220-grain subsonic bullets well.
Ready to Add the CMMG Banshee Mk4 to Your Collection?
This compact .300 Blackout pistol combines proven reliability, suppressor-ready features, and a comfortable brace in one package. Whether you’re building a home-defense setup or just want a fun range companion, the Banshee delivers.
✅ Nationwide delivery (all 50 states)
✅ Ships 1-2 business days
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See more options in our AR Pistols and .300 Blackout Uppers categories. For accessories, check our Pistol Braces section.
Last updated: April 2026
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This CMMG 30AF20ACT Banshee Mk4 300 Blackout 30+1 8″ Black Nitride Threaded Barrel, M-LOK Handguard, Coyote Tan Cerakote Aluminum Receiver w/Picatinny Rail, Black Polymer CMMG RipBrace, CMMG Zeroed Grip 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 30AF20ACT Banshee Mk4 300 Blackout 30+1 8″ Black Nitride Threaded Barrel, M-LOK Handguard, Coyote Tan Cerakote Aluminum Receiver w/Picatinny Rail, Black Polymer CMMG RipBrace, CMMG Zeroed Grip?
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