Availability: In Stock
Current Stock: Out of stock
The CMMG Banshee MK4 Fixed Ejector is a compact 9mm AR pistol built on the proven Mk4 platform, designed for shooters who want maximum capability in a tight package. With its 5-inch barrel, the Banshee delivers the shortest 9mm configuration CMMG currently offers, making it ideal for self-defense, home protection, or rapid-deployment scenarios where size and maneuverability matter. The fixed ejector radial delayed blowback system cycles 9mm reliably while keeping the overall profile manageable—just 20.8 inches end-to-end and a svelte 4.3 pounds.
What sets the Banshee apart is thoughtful engineering across the board. The billet upper receiver pairs with a forged lower for durability, while the EML4 handguard features M-LOK slots at 3, 6, and 9 o'clock plus a full-length Picatinny rail on top, giving you real estate for a dot, light, or other accessories. The quick-deploying RipBrace keeps things mobile, and the CMMG ZEROED trigger, safety, charging handle, and grip make the whole package cohesive and confident to run. Finish is Cerakote for corrosion resistance in any season.
The 9mm conversion setup uses CMMG's proprietary 30-round magazines, so you get genuine capacity without compromise. The 1:10 twist barrel, 1/2 x 28 threaded muzzle with CMMG ZEROED linear comp, and 6-position receiver extension round out a platform that's equally at home on the bench, in a vehicle, or staged for self-defense. Whether you're a dedicated AR shooter looking to add a nimble 9mm to the safe or someone building a serious compact pistol from the ground up, the Banshee MK4 delivers serious capability in a package that doesn't apologize for its size.
| Platform | CMMG Mk4 |
| Caliber | 9mm Luger |
| Operating System | Fixed Ejector Radial Delayed Blowback |
| Barrel Length | 5 inches |
| Barrel Twist | 1:10 |
| Barrel Contour | MT |
| Barrel Material | 4140CM SBN |
| Muzzle Device | CMMG ZEROED Linear Comp |
| Muzzle Thread | 1/2 x 28 |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075-T6 Aluminum |
| Handguard | CMMG EML4 M-LOK with integrated handstop |
| Charging Handle | CMMG ZEROED Ambi |
| Pistol Grip | CMMG ZEROED |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6-Position Fastback |
| Brace | CMMG RipBrace |
| Trigger | CMMG ZEROED Drop-In Single Stage |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Magazine Included | CMMG 9ARC 30rd |
| Finish | Cerakote Armor Black |
| Overall Length | 20.8 inches |
| Weight | 4.3 lbs |
The Banshee uses CMMG's proprietary 9mm conversion magazines. The pistol comes with one CMMG 9ARC 30-round magazine.
The Banshee ships with a RipBrace and is classified as a pistol. Always verify compliance with your local and state laws before purchase or transport, as regulations vary by jurisdiction.
The EML4 handguard features M-LOK slots at 3, 6, and 9 o'clock positions and a full-length Picatinny rail on top, giving you flexible mounting options for lights, lasers, optics, and other tactical gear.
Fully configured as shipped, the Banshee MK4 weighs 4.3 pounds, making it a lightweight, maneuverable platform for its capability.
SKU: 198468753 • Width: 13.5in • Height: 4in • Depth: 39.5in • Weight: 9.7oz
Availability: In Stock
Current Stock: Out of stock
The CMMG Banshee MK4 Fixed Ejector is a compact 9mm AR pistol built on the proven Mk4 platform, designed for shooters who want maximum capability in a tight package. With its 5-inch barrel, the Banshee delivers the shortest 9mm configuration CMMG currently offers, making it ideal for self-defense, home protection, or rapid-deployment scenarios where size and maneuverability matter. The fixed ejector radial delayed blowback system cycles 9mm reliably while keeping the overall profile manageable—just 20.8 inches end-to-end and a svelte 4.3 pounds.
What sets the Banshee apart is thoughtful engineering across the board. The billet upper receiver pairs with a forged lower for durability, while the EML4 handguard features M-LOK slots at 3, 6, and 9 o'clock plus a full-length Picatinny rail on top, giving you real estate for a dot, light, or other accessories. The quick-deploying RipBrace keeps things mobile, and the CMMG ZEROED trigger, safety, charging handle, and grip make the whole package cohesive and confident to run. Finish is Cerakote for corrosion resistance in any season.
The 9mm conversion setup uses CMMG's proprietary 30-round magazines, so you get genuine capacity without compromise. The 1:10 twist barrel, 1/2 x 28 threaded muzzle with CMMG ZEROED linear comp, and 6-position receiver extension round out a platform that's equally at home on the bench, in a vehicle, or staged for self-defense. Whether you're a dedicated AR shooter looking to add a nimble 9mm to the safe or someone building a serious compact pistol from the ground up, the Banshee MK4 delivers serious capability in a package that doesn't apologize for its size.
| Platform | CMMG Mk4 |
| Caliber | 9mm Luger |
| Operating System | Fixed Ejector Radial Delayed Blowback |
| Barrel Length | 5 inches |
| Barrel Twist | 1:10 |
| Barrel Contour | MT |
| Barrel Material | 4140CM SBN |
| Muzzle Device | CMMG ZEROED Linear Comp |
| Muzzle Thread | 1/2 x 28 |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | Mk4 Forged 7075-T6 Aluminum |
| Handguard | CMMG EML4 M-LOK with integrated handstop |
| Charging Handle | CMMG ZEROED Ambi |
| Pistol Grip | CMMG ZEROED |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6-Position Fastback |
| Brace | CMMG RipBrace |
| Trigger | CMMG ZEROED Drop-In Single Stage |
| Trigger Guard | CMMG ZEROED |
| Safety Selector | CMMG ZEROED 60/90 Degree |
| Magazine Included | CMMG 9ARC 30rd |
| Finish | Cerakote Armor Black |
| Overall Length | 20.8 inches |
| Weight | 4.3 lbs |
The Banshee uses CMMG's proprietary 9mm conversion magazines. The pistol comes with one CMMG 9ARC 30-round magazine.
The Banshee ships with a RipBrace and is classified as a pistol. Always verify compliance with your local and state laws before purchase or transport, as regulations vary by jurisdiction.
The EML4 handguard features M-LOK slots at 3, 6, and 9 o'clock positions and a full-length Picatinny rail on top, giving you flexible mounting options for lights, lasers, optics, and other tactical gear.
Fully configured as shipped, the Banshee MK4 weighs 4.3 pounds, making it a lightweight, maneuverable platform for its capability.
SKU: 198468753 • Width: 13.5in • Height: 4in • Depth: 39.5in • Weight: 9.7oz