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Availability: In Stock
The CMMG Banshee MK4 in .300 Blackout is a purpose-built AR pistol that brings serious capability to a compact platform. With an 8-inch medium taper threaded barrel and direct impingement system, this Banshee handles both subsonic and supersonic .300 BLK loads with reliability. The Midnight Bronze Cerakote finish on the billet upper receiver pairs sharp aesthetics with corrosion resistance—this isn't just another black rifle. At 23.7 inches overall and weighing just 5.1 pounds, the Banshee punches well above its weight class for personal defense, short-range shooting, and specialized applications where an AR pistol makes sense.
What sets the Banshee apart is its thoughtful ergonomics and modularity. The 7-inch EML handguard is studded with M-LOK slots on the sides and bottom, plus M-LOK sections between top Picatinny rail segments—you've got real estate for lights, lasers, and other must-haves without fighting for space. The CMMG Zeroed ambi charging handle, 60/90-degree safety selector, and drop-in single-stage trigger all come dialed in. The adjustable .750 gas block lets you tune the gun to your ammo and can help mitigate recoil in a compact package. Swap the included Magpul 30-round PMAG for your preferred magazine and you're ready to run.
The RipBrace gives you the brace you'd expect on a quality AR pistol, and the 6-position Fastback extension keeps the platform tunable. Whether you're running subsonic ammo through a can or pushing supersonic .300 BLK, the Banshee MK4 delivers a versatile platform that doesn't compromise on build quality or functionality. This is a rifle-caliber AR pistol built for shooters who demand both performance and reliability.
| Caliber | .300 Blackout |
| Platform | CMMG MK4 |
| Barrel Length | 8 inches |
| Barrel Contour | Medium Taper |
| Barrel Material | 4140CM Steel |
| Barrel Twist | 1:7 |
| Muzzle Thread | 5/8x24 |
| Muzzle Device | CMMG Zeroed Linear Comp |
| Operating System | Direct Impingement |
| Gas Block | Adjustable .750 |
| Gas Port | Pistol |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | MK4 Forged 7075-T6 Aluminum |
| Handguard | CMMG EML7 M-LOK |
| Receiver Extension | CMMG 6-Position Fastback |
| Brace | CMMG RipBrace |
| Trigger | CMMG Zeroed Drop-In Single Stage |
| Charging Handle | CMMG Zeroed Ambi |
| Safety Selector | CMMG Zeroed 60/90 Degree |
| Pistol Grip | CMMG Zeroed |
| Trigger Guard | CMMG Zeroed |
| Magazine Included | Magpul PMAG 30-round |
| Buffer Type | Carbine |
| Finish | Midnight Bronze Cerakote |
| Overall Length | 23.7 inches |
| Weight | 5.1 pounds |
The Banshee ships with a Magpul 30-round PMAG and all components needed to run it as configured. The CMMG Zeroed furniture—trigger, charging handle, safety selector, trigger guard, and grips—are already installed.
Yes. The 8-inch barrel has a 5/8x24 threaded muzzle ready for a suppressor. The .300 Blackout round was originally designed for subsonic suppressed applications, and the Banshee's adjustable gas block lets you tune the system for your ammo and suppressor setup.
The medium taper strikes a balance between weight and rigidity. For an 8-inch barrel on a pistol platform, medium taper provides adequate stiffness without unnecessary mass—important when you're building a compact, maneuverable gun.
CMMG includes the RipBrace on this platform. We cannot provide legal guidance; please review current ATF regulations and consult with legal counsel regarding pistol brace compliance in your jurisdiction.
SKU: 198468747 • Width: 13.5in • Height: 4.2in • Depth: 39.6in • Weight: 4oz
Availability: In Stock
The CMMG Banshee MK4 in .300 Blackout is a purpose-built AR pistol that brings serious capability to a compact platform. With an 8-inch medium taper threaded barrel and direct impingement system, this Banshee handles both subsonic and supersonic .300 BLK loads with reliability. The Midnight Bronze Cerakote finish on the billet upper receiver pairs sharp aesthetics with corrosion resistance—this isn't just another black rifle. At 23.7 inches overall and weighing just 5.1 pounds, the Banshee punches well above its weight class for personal defense, short-range shooting, and specialized applications where an AR pistol makes sense.
What sets the Banshee apart is its thoughtful ergonomics and modularity. The 7-inch EML handguard is studded with M-LOK slots on the sides and bottom, plus M-LOK sections between top Picatinny rail segments—you've got real estate for lights, lasers, and other must-haves without fighting for space. The CMMG Zeroed ambi charging handle, 60/90-degree safety selector, and drop-in single-stage trigger all come dialed in. The adjustable .750 gas block lets you tune the gun to your ammo and can help mitigate recoil in a compact package. Swap the included Magpul 30-round PMAG for your preferred magazine and you're ready to run.
The RipBrace gives you the brace you'd expect on a quality AR pistol, and the 6-position Fastback extension keeps the platform tunable. Whether you're running subsonic ammo through a can or pushing supersonic .300 BLK, the Banshee MK4 delivers a versatile platform that doesn't compromise on build quality or functionality. This is a rifle-caliber AR pistol built for shooters who demand both performance and reliability.
| Caliber | .300 Blackout |
| Platform | CMMG MK4 |
| Barrel Length | 8 inches |
| Barrel Contour | Medium Taper |
| Barrel Material | 4140CM Steel |
| Barrel Twist | 1:7 |
| Muzzle Thread | 5/8x24 |
| Muzzle Device | CMMG Zeroed Linear Comp |
| Operating System | Direct Impingement |
| Gas Block | Adjustable .750 |
| Gas Port | Pistol |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | MK4 Forged 7075-T6 Aluminum |
| Handguard | CMMG EML7 M-LOK |
| Receiver Extension | CMMG 6-Position Fastback |
| Brace | CMMG RipBrace |
| Trigger | CMMG Zeroed Drop-In Single Stage |
| Charging Handle | CMMG Zeroed Ambi |
| Safety Selector | CMMG Zeroed 60/90 Degree |
| Pistol Grip | CMMG Zeroed |
| Trigger Guard | CMMG Zeroed |
| Magazine Included | Magpul PMAG 30-round |
| Buffer Type | Carbine |
| Finish | Midnight Bronze Cerakote |
| Overall Length | 23.7 inches |
| Weight | 5.1 pounds |
The Banshee ships with a Magpul 30-round PMAG and all components needed to run it as configured. The CMMG Zeroed furniture—trigger, charging handle, safety selector, trigger guard, and grips—are already installed.
Yes. The 8-inch barrel has a 5/8x24 threaded muzzle ready for a suppressor. The .300 Blackout round was originally designed for subsonic suppressed applications, and the Banshee's adjustable gas block lets you tune the system for your ammo and suppressor setup.
The medium taper strikes a balance between weight and rigidity. For an 8-inch barrel on a pistol platform, medium taper provides adequate stiffness without unnecessary mass—important when you're building a compact, maneuverable gun.
CMMG includes the RipBrace on this platform. We cannot provide legal guidance; please review current ATF regulations and consult with legal counsel regarding pistol brace compliance in your jurisdiction.
SKU: 198468747 • Width: 13.5in • Height: 4.2in • Depth: 39.6in • Weight: 4oz