CMMG Banshee Mk4 Pistol .300 AAC Blackout 8″ 30rd
Specs at a glance
About this product
The CMMG Banshee Mk4 pistol in .300 AAC Blackout with an 8-inch barrel and 30-round magazine delivers a compact, suppressor-ready platform with factory ambidextrous controls and a threaded barrel. Built for shooters who need a reliable short-barrel pistol for home defense, truck carry, or quiet shooting with subsonic loads.
Nationwide shipping. Order from anywhere in the US.
The CMMG Banshee Mk4 pistol chambered in .300 AAC Blackout with an 8-inch barrel and 30-round magazine is purpose-built for shooters who want a compact, suppressed-ready platform without sacrificing reliability. This is the cmmg banshee mk4 pistol .300 aac blackout 8″ 30rd — a factory-built short-barrel pistol that combines the proven AR-15 ergonomics with a caliber that excels in subsonic and supersonic loads. Whether you are running a suppressor for quiet work or need a truck gun that packs a punch, this pistol delivers.
| Manufacturer | CMMG, Inc. |
|---|---|
| Model | Banshee Mk4 |
| Caliber | .300 AAC Blackout |
| Barrel Length | 8 inches (threaded 5/8×24) |
| Handguard | CMMG EML M-LOK, 7 inches |
| Capacity | 30 rounds (1 magazine) |
| Weight | 5 lbs 12 oz (per manufacturer specs) |
| Finish | Hardcoat anodized black |
| Condition | New |
Key Features
- 8-inch 4150 Chrome Moly Vanadium Barrel — Why it matters: The 1:8 twist rate stabilizes both subsonic and supersonic .300 Blackout loads, giving you the flexibility to run heavy 220-grain subs or fast 110-grain supers without losing accuracy.
- CMMG EML M-LOK Handguard — Why it matters: Full-length M-LOK slots and a continuous top Picatinny rail let you mount lights, lasers, or a red dot without adding bulk. The handguard stays cool under rapid fire and keeps the profile slim.
- Ambidextrous Controls — Why it matters: The Banshee Mk4 comes with an ambidextrous safety selector, bolt catch, and magazine release from the factory. Left-handed shooters don’t have to swap parts, and right-handed shooters get faster reloads.
- Linear Compensator / Flash Can — Why it matters: The factory-installed linear compensator directs blast forward, reducing perceived recoil and keeping muzzle flash away from your support hand. It also serves as a mounting point for suppressors when you’re ready.
- Compact 8-Inch Barrel with Pistol Brace — Why it matters: The overall length stays under 26 inches, making it easy to maneuver in tight spaces like vehicles, hallways, or hunting blinds. The pistol tube accepts standard AR-15 pistol braces for legal compliance.
Who It’s For
This pistol is for the shooter who wants a dedicated .300 Blackout platform for suppressed use, home defense, or truck carry. It suits the traditional AR-15 enthusiast who appreciates a factory-built gun that doesn’t require a tax stamp for the barrel length. It’s also ideal for hunters who need a compact, quiet rifle for hogs or varmints when paired with a suppressor and subsonic ammunition.
Pros & Cons
- Pros: Factory-built, no assembly required; ambidextrous controls out of the box; threaded barrel ready for suppressors; 30-round magazine included; reliable gas system with CMMG’s proprietary bolt carrier group.
- Con: The 8-inch barrel limits velocity compared to a 10.5- or 16-inch barrel. Per CMMG specs, subsonic rounds lose about 50-70 fps compared to a 10.5-inch barrel, though this is typical for short-barrel .300 Blackout pistols.
Comparison
| Feature | CMMG Banshee Mk4 .300 BLK | Zev Technologies OZ9C | Geissele Super Duty Pistol |
|---|---|---|---|
| Caliber | .300 AAC Blackout | 9mm | 5.56 NATO |
| Barrel Length | 8 inches | 4.5 inches | 10.3 inches |
| Gas System | Direct impingement | Striker-fired | Direct impingement |
| Weight | 5.75 lbs | 2.1 lbs | 6.2 lbs |
| Suppressor Ready | Yes (threaded 5/8×24) | No (pistol) | Yes (threaded 1/2×28) |
| Ambidextrous Controls | Factory standard | Optional | Factory standard |
| Price | $1,359.85 | $1,299.00 | $1,899.00 |
FAQ
Can I shoot both subsonic and supersonic .300 Blackout in this pistol?
Yes. The 1:8 twist barrel handles both subsonic (220-grain) and supersonic (110-125 grain) loads reliably. For best accuracy, test a few brands to see what your gun likes.
Does this pistol come with a brace or a buffer tube?
It ships with a standard AR-15 pistol buffer tube and no brace. You can add any aftermarket pistol brace that fits a mil-spec buffer tube.
Is the barrel threaded for a suppressor?
Yes. The 8-inch barrel is threaded 5/8×24 with a linear compensator installed. Remove the compensator to attach a .30-caliber suppressor.
What magazines does it use?
It uses standard AR-15 .300 Blackout magazines. The included 30-round magazine is a Magpul PMAG. Note: Do not mix 5.56 and .300 BLK magazines — use dedicated .300 BLK mags to prevent chambering the wrong round.
Is this pistol legal to own without a tax stamp?
Yes. The overall length exceeds 26 inches with the brace installed, and the barrel is under 16 inches, so it is classified as a pistol under federal law. Check your state and local laws before purchasing.
Trust & Delivery
- ✓ Nationwide delivery (all 50 states) to your FFL dealer
- ✓ Ships 1-2 business days from order
- ✓ 30-day return policy (unfired, in original packaging)
- ✓ Secure checkout with encrypted payment
Browse more AR Pistols or check our Suppressor Accessories and AR-15 Parts for upgrades.
Last updated: April 2026