CMMG Resolute MK4 Upper Group 300 AAC 14.5" Pinned
- 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 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
- 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 group in 300 AAC Blackout with 14.5" pinned-and-welded barrel. Complete upper assembly without bolt carrier group or charging handle.
CMMG Resolute MK4 Upper Receiver Group
The CMMG Resolute MK4 upper receiver group delivers a compact, effective platform for 300 AAC Blackout shooters who demand reliability and precision.
Key Features
- Caliber: 300 AAC Blackout
- Barrel Length: 14.5" pinned and welded
- Configuration: Upper receiver assembly only (bolt carrier group and charging handle not included)
- Platform: Modern direct impingement design
- Manufacturer: CMMG, known for quality AR-platform components
What You Get
This upper receiver group includes the barrel, upper receiver, handguard, and gas system—everything you need except the bolt carrier group and charging handle. The 14.5" barrel with pinned-and-welded muzzle device meets legal requirements while maintaining the cartridge's subsonic capabilities.
Ideal For
The Resolute MK4 suits shooters building custom rifles, upgrading existing platforms, or seeking a compact 300 AAC Blackout upper. The 300 AAC cartridge excels with suppressors and performs reliably in short-barreled configurations.
Assembly Notes
You'll need to source a compatible bolt carrier group and charging handle to complete your rifle. Pair this upper with a lower receiver and fire control group to create a complete firearm.
