The CMMG Resolute MK4 6mm ARC Upper Receiver features an 16.1" 1:7.5 twist barrel. The MK4 comes with a CMMG ZEROED Muzzle Brake 6.5mm, CMMG ZEROED Ambi Charging Handle, CMMG Bolt Carrier Group, and a EML15 15" M-LOK Free Float handguard.
| Barrel |
16.1" 1:7.5 twist medium taper 416 Stainless Steel with Black Salt Bath Nitride finish |
| Caliber |
6mm ARC |
| Handguard |
EML15 15" M-LOK Free Float Handguard |
| Sight |
None |
| Muzzle Device |
CMMG ZEROED Muzzle Brake 6.5mm |
| Charging Handle |
CMMG ZEROED Ambi |
| Bolt Carrier Group |
CMMG |
