CMMG BANSHEE MK4 Pistol 300BLK 8" Barrel - Armor Black Finish
$1,420.92
$1,499.95
(You save
$79.03
)
- Hand:
- Ambidextrous
- Finish-Color:
- Black
- Barrel Length:
- 8"
- Caliber-Gauge:
- 300 AAC Blackout/Whisper
The CMMG BANSHEE MK4 Pistol in .300 BLK with an 8-inch barrel delivers serious capability in a compact, maneuverable package. Built on the proven Mk4 platform, this .300 BLK AR pistol excels in close-quarters applications, home defense, and suppressed shooting—especially with subsonic ammunition. The 1:7 twist barrel stabilizes a wide range of .300 BLK loadings, from whisper-quiet subsonic rounds to supersonic hunting ammo that rivals intermediate cartridges like 7.62x39. At just 5.1 lbs and 23.7 inches overall, it's purpose-built for rapid target acquisition and tactical mobility without sacrificing the ergonomics and modularity that make AR-platform guns so adaptable.
Every major component is engineered for durability and user control. The billet 6061-T6 aluminum upper pairs with a Mk4 forged 7075-T6 lower receiver for a rigid, reliable foundation. The direct-impingement system pairs a pistol-length gas port with a non-adjustable 0.750 gas block, tuned for the platform's performance envelope. CMMG's ZEROED line handles the controls: an ambi charging handle, drop-in single-stage trigger, 60/90-degree safety, and ergonomic pistol grip designed for intuitive operation in any firing position. The CMMG RipBrace provides a modern, quick-deploying solution for legal compliance and support.
The EML7 M-LOK handguard gives you abundant mounting real estate—full-length slots on both sides, the bottom, and between top Picatinny sections—so you can outfit it exactly as you need it. The CMMG ZEROED linear compensator (5/8x24 thread) manages muzzle signature and recoil impulse. A 30-round Magpul PMAG feeds reliably, and the carbine buffer system is tuned for this short-barrel platform. Finished in armor-black Cerakote, it's a no-nonsense tool ready for duty or the range.
Key Features
- Compact 8-inch barrel optimized for .300 BLK subsonic and supersonic performance
- Direct-impingement system with pistol-length gas port for reliable cycling in a short package
- CMMG RipBrace for rapid deployment and ergonomic support
- Ambidextrous charging handle and 60/90-degree safety for versatile operation
- EML7 M-LOK handguard with extensive mounting options on all sides
- CMMG ZEROED drop-in trigger and matched controls for consistent performance
- Billet upper and forged lower receiver for durability and precision fit
- Lightweight and maneuverable at 5.1 lbs and 23.7 inches overall
- CMMG ZEROED linear compensator with 5/8x24 threads
- Includes 30-round Magpul PMAG
Specifications
| Caliber | .300 BLK |
| Platform | CMMG Mk4 |
| Barrel Length | 8 inches |
| Barrel Material | 4140CM SBN steel |
| Barrel Twist | 1:7 |
| Barrel Contour | MT |
| Operating System | Direct impingement |
| Gas Port | Pistol length |
| Gas Block | 0.750-inch non-adjustable |
| Muzzle Device | CMMG ZEROED linear compensator |
| Muzzle Thread | 5/8x24 |
| Upper Receiver | Billet 6061-T6 aluminum |
| Lower Receiver | Mk4 forged 7075-T6 aluminum |
| Handguard | CMMG EML7 M-LOK |
| Receiver Extension | CMMG 6-position Fastback |
| Stock / Brace | CMMG RipBrace |
| Charging Handle | CMMG ZEROED ambi |
| Trigger | CMMG ZEROED drop-in single stage |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED 60/90 degree |
| Pistol Grip | CMMG ZEROED |
| Buffer Type | Carbine |
| Magazine | 30-round Magpul PMAG |
| Finish | Cerakote (armor black) |
| Weight | 5.1 lbs |
| Overall Length | 23.7 inches |
Frequently Asked Questions
What is the BANSHEE MK4 best used for?
The BANSHEE MK4 is purpose-built for close-quarters applications, home defense, and suppressed shooting. The 8-inch barrel and direct-impingement system are optimized for .300 BLK subsonic ammunition, making it ideal for quiet, suppressed use. It also handles supersonic .300 BLK loads that compete with intermediate cartridges like 7.62x39, so it's versatile enough for hunting and range work where noise isn't a constraint.
Is the .300 BLK caliber good for hunting?
Yes. .300 BLK was originally designed for short-barrel applications and performs exceptionally well with subsonic suppressed loads. With supersonic ammunition, it has evolved into a capable hunting cartridge that rivals other intermediate rounds. The 1:7 twist barrel in this pistol stabilizes a wide range of .300 BLK loadings, so you can choose subsonic for stealth or supersonic for hunting performance depending on your application.
What's included in the box?
The BANSHEE MK4 ships with a 30-round Magpul PMAG. All the controls and components—the CMMG ZEROED trigger, charging handle, safety, grip, brace, and linear compensator—are installed and ready to use.
Can I add a suppressor or accessories to this pistol?
Absolutely. The CMMG ZEROED linear compensator is threaded 5/8x24, so you can attach a suppressor or other muzzle devices. The EML7 M-LOK handguard has full-length M-LOK slots on both sides, the bottom, and between the top Picatinny rail sections, giving you extensive real estate to mount lights, lasers, grips, and other must-have gear exactly how you want it.
Firearm Shipments:
To buy rifles or shotguns, you must be 18 years old, and for handguns, actions, or receivers, the minimum age is 21. By placing an order for this firearm, you confirm that you are the legitimate transferee/buyer, meet the legal age requirements, and comply with all Federal, State, and local laws and regulations necessary to purchase this firearm.
We only ship firearms to valid Federal Firearms License (FFL) holders. At checkout we provide a FFL locator for your convenience.
We will need a copy of the FFL’s license to facilitate the process, kindly request your dealer to email us a copy of their FFL, as we cannot dispatch the firearm until we receive this document. It is imperative for the buyer to choose their FFL dealer, ensure they are willing to facilitate the transfer, and have them email their FFL copy to BOSQUE Outdoors. To avoid any confusion, the customer's name or order number must be mentioned in the email containing the FFL.
Email: [email protected]
- Prior to placing an order, it is the buyer's responsibility to understand and adhere to their state's firearm regulations.
- The buyer should verify with their receiving dealer that the chosen firearm is legally permissible in their state.
- The buyer is accountable for any transfer fees or background check charges imposed by the receiving dealer. If the designated dealer declines to accept the firearm delivery, the buyer assumes responsibility for shipping costs to retrieve the firearm and resend it to an accommodating dealer.
- Handguns will be shipped using air transportation, while long guns can be shipped using ground methods. If your order includes a mix of firearm and non-firearm items, BOSQUE Outdoors will send the firearm(s) to your selected FFL dealer and the remaining non-firearm items to your billing address.
- Firearms cannot be returned to BOSQUE Outdoors; please contact the manufacturer for warranty claims.
- Firearms refused by the FFL Dealer or which cannot be transferred due to a failed background check are subject to a $75 restocking fee plus 10% of the purchase price.
