CMMG Resolute MK4 Upper Group, 300 Blackout, 16.1"
- CMMG Resolute MK4 22 ARC 16.1" Rifle $823.06
- CMMG Resolute MK4 22 ARC 16.1" Rifle $831.38
- CMMG Resolute MK4 22 ARC 16.1" Rifle $831.38
- 22LR, 16.1" Barrel $693.08
- 300 AAC 14.5" Pinned Upper $482.29
- 300 Blackout, 16.1" Barrel $823.06
- 350 Legend, 16.1" Barrel $831.38
- 5.56 16.1" Upper $823.06
- 5.56 NATO 16.1" Upper $498.07
- 6.5 Grendel 16.1" $823.06
- 6mm ARC 16.1" Upper $925.94
CMMG Resolute MK4 upper receiver in 300 Blackout with 16.1" barrel, Armor Black finish, and M-LOK free-float handguard. Bolt carrier group and charging handle sold separately.
Fits: AR-15
CMMG Resolute MK4 Upper Receiver Group
This upper receiver assembly represents a quality foundation for your next AR-platform build. Chambered in 300 Blackout, it delivers the subsonic performance and versatility that modern shooters demand.
Key Features
- Caliber: 300 Blackout (300 AAC)
- Barrel Length: 16.1 inches
- Finish: Armor Black
- Handguard: M-LOK free-float design for accessory mounting flexibility
- Configuration: Upper receiver only—requires compatible AR-15 lower receiver
What You Need to Know
This upper group does not include a bolt carrier group or charging handle, allowing you to select components that match your specific requirements and budget. The free-float handguard provides excellent accuracy potential by isolating the barrel from external pressure.
The 300 Blackout cartridge excels in short-range applications and pairs well with suppressors for reduced noise signature. This upper is compatible with standard AR-15 lower receivers and magazines.
Ready to Build
Pair this upper with your choice of lower receiver, bolt carrier group, and charging handle to complete a capable rifle for hunting, sport shooting, or home defense.
