If you are looking for a compact, quiet, and accurate AR pistol for suppressed shooting or home defense, the CMMG Banshee MK4 .300 AAC Blackout 12.5″ 30+1 is a build that makes sense right out of the box. With a 12.50″ black nitride medium-taper barrel and a 7″ EML M-LOK handguard, this firearm is designed to run subsonic loads reliably and stay balanced with a suppressor attached. According to CMMG specs, the ZEROED drop-in trigger and ambidextrous controls mean you don’t need to swap parts to get a crisp pull and lefty-friendly operation. At $1,514.52, it gives you a purpose-built pistol that is ready for the range or the nightstand.
| Manufacturer | CMMG |
|---|---|
| Model | Banshee MK4 |
| Material | 7075-T6 aluminum upper and lower receiver (per manufacturer specs) |
| Compatibility | .300 AAC Blackout magazines (includes one 30rd PMAG) |
| Finish | Black Nitride barrel, hardcoat anodized receivers |
| Weight | Approx. 6.2 lbs (unloaded, per manufacturer specs) |
| Condition | New |
Key Features
- 12.50″ Black Nitride Medium-Taper Barrel — Why it matters: The medium taper keeps weight low while the black nitride finish resists corrosion and extends barrel life, especially important when shooting suppressed strings of fire.
- 7″ EML M-LOK Handguard — Why it matters: This free-float handguard gives you plenty of rail space for a light, laser, or foregrip, and the slim profile fits smaller hands comfortably.
- ZEROED Drop-In Trigger — Why it matters: A clean, crisp trigger pull (around 4.5 lbs) helps new shooters stay on target and reduces the chance of pulling shots low and left.
- Ambidextrous Controls — Why it matters: Left-handed shooters or family members who shoot off-hand can run the safety, bolt catch, and mag release without changing grip.
- Linear Compensator — Why it matters: It directs blast forward, which reduces felt recoil and keeps noise and concussion away from the shooter — great for indoor ranges or home defense.
Who It’s For
This AR pistol is built for families who want a reliable suppressed host for training or home defense. It is also ideal for youth shooters stepping up from .22 LR, because the manageable recoil and adjustable stock options (with proper tax stamp) let it grow with them. Beginners will appreciate that it comes ready to shoot with no part swaps needed.
Pros and Cons
- Pro: Subsonic .300 Blackout ammunition is quiet enough to shoot without earplugs when suppressed, making it a good choice for hearing-safe home defense.
- Pro: The 12.5″ barrel gives you enough velocity for supersonic hunting rounds while staying compact for vehicle or home carry.
- Con: .300 AAC Blackout ammunition is more expensive than 5.56 NATO, which can limit practice time for budget-conscious shooters.
Comparison: CMMG Banshee MK4 vs. Competitors
| Feature | CMMG Banshee MK4 | Zev Technologies OZ9C | Geissele Super Duty Pistol |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 9mm | 5.56 NATO |
| Barrel Length | 12.5″ | 4.5″ | 11.5″ |
| Trigger | ZEROED drop-in, ~4.5 lbs | Zev match trigger, ~3.5 lbs | Geissele SSA, ~4.5 lbs |
| Suppressor Ready | Yes (threaded barrel + linear comp) | Threaded barrel option | Yes (threaded barrel) |
| Price (approx.) | $1,514.52 | $1,899.00 | $1,699.00 |
Frequently Asked Questions
What is the barrel twist rate on the CMMG Banshee MK4 .300 Blackout?
The 12.50″ barrel has a 1:5 twist rate, which stabilizes heavy subsonic bullets (220 grain) very well and also works with supersonic loads.
Can I use standard AR-15 magazines with this pistol?
Yes, it uses standard AR-15 pattern magazines. It ships with one 30-round PMAG, and any .300 Blackout or 5.56 NATO magazine will work.
Is the CMMG Banshee MK4 legal to own in my state?
This is classified as a pistol under federal law. Check your state and local laws regarding barrel length, overall length, and magazine capacity. Some states restrict pistols with threaded barrels or magazines over 10 rounds.
Does this model come with a brace or stock?
It ships as a pistol with no brace or stock. You can add an arm brace (no tax stamp) or apply for an ATF Form 1 to install a stock.
Trust Points
- ✅ Nationwide delivery (all 50 states)
- ✅ Ships 1-2 business days
- ✅ 30-day returns
- ✅ Secure checkout
Last updated: April 2026
Explore more: AR Pistols | .300 AAC Blackout
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This CMMG Banshee MK4 .300 AAC Blackout 12.5″ 30+1 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.
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