CMMG Banshee MK4 Pistol 300BLK 12.5" - Armor Black
$1,444.17
$1,524.95
(You save
$80.78
)
- Hand:
- Ambidextrous
- Finish-Color:
- Black
- Barrel Length:
- 12.5"
- Caliber-Gauge:
- 300 AAC Blackout/Whisper
The CMMG Banshee MK4 Pistol in .300 BLK with a 12.5" barrel is a purpose-built AR-pattern pistol that bridges the gap between raw capability and practical handling. Built on CMMG's refined Mk4 platform, this 300 Blackout pistol excels in both suppressed and subsonic applications—the cartridge's bread and butter—while delivering ballistic performance that competes with traditional intermediate rifle rounds. At 5.8 lbs and 28" overall length, it's compact enough for vehicle storage, home defense, or as a truck gun, yet substantial enough to deliver real velocity and accuracy without the complexity of a short-barreled rifle.
The .300 BLK round was engineered for suppression, and the Banshee MK4 leverages that fully. Whether you're running supers or subsonic loads, the direct impingement operating system and 1:7 twist barrel keep rounds stable and on target. The 12.5" barrel length with CMMG's ZEROED linear compensator manages recoil without sacrificing portability. The billet upper and forged lower receiver ensure durability that won't quit, while the modern Cerakote finish in Armor Black resists the elements.
Accessory mounting isn't an afterthought here. The CMMG EML11 M-LOK handguard runs full-length slots on both sides and underneath, plus M-LOK real estate between top Picatinny sections—plenty of space to hang lights, lasers, or whatever else the mission demands. The included CMMG RipBrace delivers a solid cheek weld and deploys without fumbling, while the CMMG ZEROED ambi charging handle, single-stage trigger, and 60/90-degree safety selector are all tuned for shooters who expect consistency. A Magpul 30-round PMAG ships in the box, so you're ready to run right out of it. For buyers seeking a modern AR pistol that does suppressed subsonic work without sacrifice, the Banshee MK4 is hard to beat.
Key Features
- .300 Blackout chambering optimized for suppressed and subsonic performance
- 12.5" 4140CM barrel with 1:7 twist rate for stable subsonic and supersonic flight
- Direct impingement operating system with non-adjustable gas block for reliability
- Billet 6061-T6 upper and forged 7075-T6 lower receivers for strength and precision
- Full M-LOK rail coverage on EML11 handguard for flexible accessory mounting
- CMMG RipBrace included for quick, intuitive deployment
- CMMG ZEROED ambi charging handle, single-stage trigger, and 60/90° safety selector
- CMMG ZEROED linear compensator (5/8x24 muzzle thread) for recoil management
- Carbine buffer system with 6-position receiver extension
- Magpul 30-round PMAG included
- Cerakote finish in Armor Black
- Weighs 5.8 lbs; 28" overall length
Specifications
| Caliber | .300 BLK |
| Platform | CMMG Mk4 AR15 |
| Barrel Length | 12.5" |
| Barrel Material | 4140CM |
| Barrel Twist | 1:7 |
| Barrel Contour | MT |
| Operating System | Direct Impingement |
| Gas Block | 0.750" Non-Adjustable |
| Gas Port | Pistol |
| Muzzle Device | CMMG ZEROED Linear Comp |
| Muzzle Thread | 5/8x24 |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075-T6 Aluminum |
| Handguard | CMMG EML11 M-LOK |
| 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 |
| Brace | CMMG RipBrace |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6 Position Fastback |
| Magazine | Magpul 30-Round PMAG (included) |
| Finish | Cerakote Standard (Armor Black) |
| Weight | 5.8 lbs |
| Overall Length | 28" |
Frequently Asked Questions
Is the CMMG Banshee MK4 .300 BLK pistol legal in my state?
Pistol legality varies significantly by state and local jurisdiction. We recommend checking your local and state laws regarding AR pistols, braces, and .300 BLK firearms before purchase. Bosque Outdoors can help point you in the right direction, but you are responsible for confirming compliance in your area.
Can I upgrade or customize this pistol?
Yes. The Banshee MK4 is built on CMMG's AR15 platform, which means it accepts standard AR-compatible parts and upgrades. The supplied trigger is a CMMG ZEROED drop-in unit, and the M-LOK handguard offers plenty of mounting real estate for lights, lasers, and other accessories. Beyond that, you're limited mainly by your imagination and your local laws.
What's included in the box?
The Banshee MK4 comes with a Magpul 30-round PMAG magazine and the CMMG RipBrace already installed. The linear compensator and all the featured CMMG ZEROED components (charging handle, trigger, safety, grip, trigger guard) are factory-installed and ready to run.
Why .300 Blackout over other pistol calibers?
.300 BLK was purpose-designed for suppressed and subsonic applications. It delivers real intermediate rifle performance, especially in subsonic loads, while the 1:7 twist barrel on this Banshee ensures stability across both subsonic and supersonic ammunition. If suppression or subsonic shooting is part of your plan, .300 BLK is the natural choice.
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.
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