The CMMG MK4 Upper Receiver is designed for 223 Remington/556NATO and made from Billet 7075-T6 Aluminum with an Armor Black Cerakote finish. It ships with installed dust cover and forward assist assembly for added convenience.
Specs
| Model No. | CMMG55BA206-AB |
| Model | MK4 |
| Manufacturer | CMMG |
| Color | Black |
| Caliber | 223 Remington |
