CMMG Resolute MK4 5.56 NATO 16.1" Upper Receiver
- 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" $482.29
- 300 Blackout, 16.1" Barrel $823.06
- 350 Legend, 16.1" Barrel $831.38
- 5.56 16.1" Upper $823.06
- 6.5 Grendel 16.1" $823.06
- 6mm ARC 16.1" Upper $925.94
CMMG Resolute MK4 upper receiver in 5.56 NATO with 16.1" barrel, M-LOK free-float handguard, and Armor Black finish. Receiver only—no bolt carrier group or charging handle included.
Fits: AR-15
CMMG Resolute MK4 Upper Receiver
The Resolute MK4 represents a straightforward, no-nonsense approach to AR-platform upper receivers. Chambered in 5.56 NATO, this upper is built for shooters who understand that quality components matter.
Key Features
- Barrel: 16.1" chrome-moly steel, optimized for accuracy and reliability
- Handguard: M-LOK free-float design allows for accessory mounting without affecting barrel harmonics
- Finish: Armor Black for corrosion resistance and professional appearance
- Compatibility: Designed to mate with any standard AR-15 lower receiver
What You're Getting
This is an upper receiver assembly only. You will need to source a bolt carrier group and charging handle separately to complete your build. The free-float handguard ensures consistent accuracy by isolating the barrel from external pressure points.
Ideal For
Builders looking for a reliable, mid-range upper receiver that doesn't compromise on quality. Whether you're assembling your first AR or adding to an existing collection, the Resolute MK4 delivers proven performance at a practical price point.
