CMMG145480054
Cmmg Banshee 54Ae10Fab Mk4 5.7X28 8 Brc Arblk$1,512.64
Availability: In Stock
Current Stock: Out of stock
The CMMG Banshee 40 in .40 S&W is a purpose-built pistol-caliber carbine that brings serious stopping power to close-quarters work, home defense, and the range. Built on CMMG's proven MkGs platform, this 8-inch barreled rifle trades nothing in capability despite its compact profile. The radial delayed blowback system cycles .40 S&W with authority, delivering the ballistic advantage of a rifle while maintaining the ergonomics and magazine compatibility shooters already know—it runs standard Glock-pattern magazines in the .40 S&W caliber, making ammunition and spare mags easy to source.
Compact doesn't mean stripped-down. The Banshee 40 comes equipped with professional-grade internals: a ZEROED drop-in trigger for clean breaks, an ambidextrous charging handle for either-hand operation, and a 60/90-degree safety selector that works intuitively whether you're shouldering it or running it with the RipBrace. The billet upper and forged lower receivers are finished in Cerakote for a durable, professional appearance, while the CMMG EML7 M-LOK handguard gives you real estate for lights, lasers, or vertical grips. A linear compensator (threaded 0.578 x 28) minimizes blast without relying on a folding brace to manage recoil.
At just 23.8 inches long and 5.3 pounds, the Banshee 40 fits tight workspaces—vehicles, safes, shallow closets—without sacrificing shootability. Whether you're building a truck gun, a home-defense backup, or a distinct training platform that leverages your service or duty weapon's manual of arms, the MkGs Banshee in .40 S&W is built to perform.
| Caliber | .40 S&W |
| Platform | CMMG MkGs |
| Barrel Length | 8 inches |
| Barrel Twist | 1:16 |
| Barrel Material | 4140CM Steel (SBN contour) |
| Operating System | Radial Delayed Blowback |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | Forged 7075-T6 Aluminum (MkGs) |
| Handguard | CMMG EML7 M-LOK |
| Trigger | ZEROED Drop-In Single Stage |
| Trigger Guard | Integrated |
| Safety Selector | CMMG ZEROED 60/90 Degree (Ambidextrous) |
| Charging Handle | CMMG ZEROED Ambidextrous |
| Muzzle Device | CMMG ZEROED Linear Compensator |
| Muzzle Thread | 0.578 x 28 |
| Pistol Grip | CMMG ZEROED |
| Brace | CMMG RipBrace |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6-Position Fastback |
| Magazine Compatibility | Glock-pattern magazines (.40 S&W) |
| Magazine Capacity | Up to 22 rounds |
| Finish | Cerakote Standard |
| Overall Length | 23.8 inches |
| Weight | 5.3 pounds |
The Banshee 40 accepts small-frame Glock-pattern magazines in .40 S&W. Magazines must match the caliber of your upper group (in this case, .40 S&W), and the platform supports up to 22-round capacity.
Yes. At 23.8 inches and 5.3 pounds, the Banshee 40 is compact enough for vehicles, safes, and tight spaces while delivering rifle-caliber handling and ballistic performance. The radial delayed blowback system is reliable in .40 S&W, and the ambidextrous controls and drop-in trigger support defensive shooting.
The rifle includes the CMMG RipBrace, CMMG ZEROED linear compensator, ambidextrous charging handle, drop-in trigger, and all standard furniture as listed in the specifications.
The Banshee 40 features a CMMG ZEROED linear compensator with a 0.578 x 28 thread pitch. Suppressors or other muzzle devices with this thread pitch are compatible, subject to local laws and regulations.
SKU: 145480057 • Weight: 7oz
Availability: In Stock
Current Stock: Out of stock
The CMMG Banshee 40 in .40 S&W is a purpose-built pistol-caliber carbine that brings serious stopping power to close-quarters work, home defense, and the range. Built on CMMG's proven MkGs platform, this 8-inch barreled rifle trades nothing in capability despite its compact profile. The radial delayed blowback system cycles .40 S&W with authority, delivering the ballistic advantage of a rifle while maintaining the ergonomics and magazine compatibility shooters already know—it runs standard Glock-pattern magazines in the .40 S&W caliber, making ammunition and spare mags easy to source.
Compact doesn't mean stripped-down. The Banshee 40 comes equipped with professional-grade internals: a ZEROED drop-in trigger for clean breaks, an ambidextrous charging handle for either-hand operation, and a 60/90-degree safety selector that works intuitively whether you're shouldering it or running it with the RipBrace. The billet upper and forged lower receivers are finished in Cerakote for a durable, professional appearance, while the CMMG EML7 M-LOK handguard gives you real estate for lights, lasers, or vertical grips. A linear compensator (threaded 0.578 x 28) minimizes blast without relying on a folding brace to manage recoil.
At just 23.8 inches long and 5.3 pounds, the Banshee 40 fits tight workspaces—vehicles, safes, shallow closets—without sacrificing shootability. Whether you're building a truck gun, a home-defense backup, or a distinct training platform that leverages your service or duty weapon's manual of arms, the MkGs Banshee in .40 S&W is built to perform.
| Caliber | .40 S&W |
| Platform | CMMG MkGs |
| Barrel Length | 8 inches |
| Barrel Twist | 1:16 |
| Barrel Material | 4140CM Steel (SBN contour) |
| Operating System | Radial Delayed Blowback |
| Upper Receiver | Billet 6061-T6 Aluminum |
| Lower Receiver | Forged 7075-T6 Aluminum (MkGs) |
| Handguard | CMMG EML7 M-LOK |
| Trigger | ZEROED Drop-In Single Stage |
| Trigger Guard | Integrated |
| Safety Selector | CMMG ZEROED 60/90 Degree (Ambidextrous) |
| Charging Handle | CMMG ZEROED Ambidextrous |
| Muzzle Device | CMMG ZEROED Linear Compensator |
| Muzzle Thread | 0.578 x 28 |
| Pistol Grip | CMMG ZEROED |
| Brace | CMMG RipBrace |
| Buffer Type | Carbine |
| Receiver Extension | CMMG 6-Position Fastback |
| Magazine Compatibility | Glock-pattern magazines (.40 S&W) |
| Magazine Capacity | Up to 22 rounds |
| Finish | Cerakote Standard |
| Overall Length | 23.8 inches |
| Weight | 5.3 pounds |
The Banshee 40 accepts small-frame Glock-pattern magazines in .40 S&W. Magazines must match the caliber of your upper group (in this case, .40 S&W), and the platform supports up to 22-round capacity.
Yes. At 23.8 inches and 5.3 pounds, the Banshee 40 is compact enough for vehicles, safes, and tight spaces while delivering rifle-caliber handling and ballistic performance. The radial delayed blowback system is reliable in .40 S&W, and the ambidextrous controls and drop-in trigger support defensive shooting.
The rifle includes the CMMG RipBrace, CMMG ZEROED linear compensator, ambidextrous charging handle, drop-in trigger, and all standard furniture as listed in the specifications.
The Banshee 40 features a CMMG ZEROED linear compensator with a 0.578 x 28 thread pitch. Suppressors or other muzzle devices with this thread pitch are compatible, subject to local laws and regulations.
SKU: 145480057 • Weight: 7oz