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CMMG
The CMMG Resolute Upper Group in 9mm is a complete, ready-to-assemble upper receiver built for shooters who want a compact, economical alternative to .223 for general-purpose shooting and training. Chambered in 9mm with a 16.1-inch barrel and fixed ejector radial delayed blowback operation, this upper delivers reliable cycling with straight-wall pistol ammunition while maintaining practical velocity and accuracy. It's a straightforward choice for AR platform builds that prioritize versatility and lower ammunition costs without compromise.
This upper ships as a single functional unit compatible with CMMG Mk4, Mk9, Mk17, and MkGs lower receivers. The 16.1-inch barrel is twist-rated 1:10 and features the MT contour in durable 4140CM steel, paired with CMMG's ZEROED muzzle brake threaded 1/2 x 28. The billet 6061-T6 aluminum receiver is finished in Cerakote, and the integral CMMG EML15 M-LOK hand guard gives you genuine mounting real estate for lights, lasers, or accessories. An ambi ZEROED charging handle is included, so you get everything needed to start building without hunting for compatible parts.
At 4.0 lbs and 25.3 inches overall, the Resolute upper is lightweight enough for standing or bench shooting yet long enough to maximize 9mm subsonic and standard-velocity loads. Whether you're setting up a dedicated pistol-caliber carbine for the range, a truck gun, or a training platform that's gentler on the wallet than centerfire, this upper handles the role with straightforward reliability and practical ergonomics.
| Caliber | 9mm |
| Platform | CMMG Mk4, Mk9, Mk17, MkGs compatible |
| Barrel Length | 16.1 inches |
| Barrel Twist | 1:10 |
| Barrel Contour | MT |
| Barrel Material | 4140CM steel |
| Operating System | Fixed ejector radial delayed blowback |
| Muzzle Device | CMMG ZEROED muzzle brake |
| Muzzle Threads | 1/2 x 28 |
| Upper Receiver | Billet 6061-T6 aluminum |
| Finish | Cerakote standard |
| Hand Guard | CMMG EML15 M-LOK |
| Charging Handle | CMMG ZEROED ambidextrous |
| Overall Length | 25.3 inches |
| Weight | 4.0 lbs |
This upper is designed to work with CMMG Mk4, Mk9, Mk17, and MkGs lower receivers. Always verify lower compatibility with your specific receiver before assembly.
The Resolute upper is a complete, finished assembly. It includes the receiver, barrel, muzzle brake, hand guard, and ambidextrous charging handle. You will need to source a compatible lower receiver to complete the rifle.
The barrel features a 1:10 twist rate. This twist is suited to standard 9x19 ammunition, including both full-velocity and subsonic loads, though CMMG publishes specific load data—consult their manual for best results with your ammunition choice.
The integrated CMMG EML15 hand guard uses the M-LOK standard, so any M-LOK-compatible accessories—lights, lasers, grips, rail sections—will fit securely along the length of the guard.
CMMG
The CMMG Resolute Upper Group in 9mm is a complete, ready-to-assemble upper receiver built for shooters who want a compact, economical alternative to .223 for general-purpose shooting and training. Chambered in 9mm with a 16.1-inch barrel and fixed ejector radial delayed blowback operation, this upper delivers reliable cycling with straight-wall pistol ammunition while maintaining practical velocity and accuracy. It's a straightforward choice for AR platform builds that prioritize versatility and lower ammunition costs without compromise.
This upper ships as a single functional unit compatible with CMMG Mk4, Mk9, Mk17, and MkGs lower receivers. The 16.1-inch barrel is twist-rated 1:10 and features the MT contour in durable 4140CM steel, paired with CMMG's ZEROED muzzle brake threaded 1/2 x 28. The billet 6061-T6 aluminum receiver is finished in Cerakote, and the integral CMMG EML15 M-LOK hand guard gives you genuine mounting real estate for lights, lasers, or accessories. An ambi ZEROED charging handle is included, so you get everything needed to start building without hunting for compatible parts.
At 4.0 lbs and 25.3 inches overall, the Resolute upper is lightweight enough for standing or bench shooting yet long enough to maximize 9mm subsonic and standard-velocity loads. Whether you're setting up a dedicated pistol-caliber carbine for the range, a truck gun, or a training platform that's gentler on the wallet than centerfire, this upper handles the role with straightforward reliability and practical ergonomics.
| Caliber | 9mm |
| Platform | CMMG Mk4, Mk9, Mk17, MkGs compatible |
| Barrel Length | 16.1 inches |
| Barrel Twist | 1:10 |
| Barrel Contour | MT |
| Barrel Material | 4140CM steel |
| Operating System | Fixed ejector radial delayed blowback |
| Muzzle Device | CMMG ZEROED muzzle brake |
| Muzzle Threads | 1/2 x 28 |
| Upper Receiver | Billet 6061-T6 aluminum |
| Finish | Cerakote standard |
| Hand Guard | CMMG EML15 M-LOK |
| Charging Handle | CMMG ZEROED ambidextrous |
| Overall Length | 25.3 inches |
| Weight | 4.0 lbs |
This upper is designed to work with CMMG Mk4, Mk9, Mk17, and MkGs lower receivers. Always verify lower compatibility with your specific receiver before assembly.
The Resolute upper is a complete, finished assembly. It includes the receiver, barrel, muzzle brake, hand guard, and ambidextrous charging handle. You will need to source a compatible lower receiver to complete the rifle.
The barrel features a 1:10 twist rate. This twist is suited to standard 9x19 ammunition, including both full-velocity and subsonic loads, though CMMG publishes specific load data—consult their manual for best results with your ammunition choice.
The integrated CMMG EML15 hand guard uses the M-LOK standard, so any M-LOK-compatible accessories—lights, lasers, grips, rail sections—will fit securely along the length of the guard.
