| Platform | MkGs |
| Caliber | .40 S&W |
| Operating System | Radial Delayed Blowback |
| Barrel Length | 16.1 |
| Barrel Twist | 1:16 |
| Barrel Contour | MT |
| Barrel Material | 4140CM, SBN |
| Barrel Twist | 1:16 |
| Muzzle Device | CMMG ZEROED Muzzle Brake |
| Muzzle Thread | 0.578 x 28 |
| Gas Port Location | N/A |
| Gas Block | N/A |
| Upper Receiver | Billet 6061 T6 Aluminum |
| Hand Guard | CMMG EML15 M-LOK |
| Finish | Cerakote Standard |
| Charging Handle | CMMG ZEROED Ambi |
| Weight | 3.9 lbs |
| Length | 25.3" |
Expected to ship within 15-30 business days. Build to Order products are items that are not built but all components are in stock and ready for assembly.
THIS PRODUCT IS BACKED BY THE CMMG LIFETIME QUALITY GUARANTEE.
UPPER GROUP, RESOLUTE, MkGs, 40S&W, 16.1"
If you’re looking for the ultimate pistol caliber carbine chambering, don’t sleep on .40 S&W. This MkGs® RESOLUTE® Upper Group is designed to extract the full, hard-hitting performance of .40 S&W in a package that’s easy to shoot with style in a class of its own. Available in seven different Cerakote finishes, all CMMG® Upper Groups come complete with bolt carrier group and ZEROED™ accessories including:
ZEROED AR15 Polymer Dust Cover
ZEROED AR15 Ambi Charging Handle
Radial Delayed Blowback™ Operating System
Originally developed for the .45 ACP MkG platform, CMMG has adapted our Radial Delayed Blowback system across our pistol caliber lineup to create pistols and rifles with a softer recoil impulse and reduced bolt weight compared to traditional straight blowback systems. Check out our CMMG Resources article & video to learn more about what sets Radial Delayed Blowback apart.
All CMMG .40 S&W MkGs uppers are only designed for use with MkGs lowers. CMMG cannot guarantee function with other manufacturers’ lowers.
We aim to please, that’s why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.