CMMG Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Armor Black
$849.99 at MidwayUSA · 2 stores
In stock
CMMG Mk4 Resolute Upper Receiver Group 6.5mm Grendel 16.1in Armor Black
No ratings yetBest price
$849.99at MidwayUSA
In stock checked Oct 22, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| MidwayUSA Best price | $849.99checked Oct 22, 2026 | In stock | Buy at MidwayUSA | |
| OpticsPlanet | $859.99Salechecked Oct 22, 2026 | In stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $849.99 at MidwayUSA. Dashed line = out of stock. Tracking since Oct 12, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| MidwayUSA | $849.99 | $849.99 | $849.99 |
| OpticsPlanet | $859.99 | $859.99 | $859.99 |
Since Oct 12, 2026.
About this part
The CMMG Mk4 Resolute Upper Receiver Group 6.5mm Grendel 16.1in Armor Black is a 16.1" AR-15 upper receiver from CMMG. It's sold by 2 stores (2 in stock), from $849.99 to $859.99. The lowest in-stock price in the last 30 days was $849.99 at MidwayUSA.
Fits and works with
- Barrel length
- 16.1" · Handguards
Specifications
- Manufacturer
- CMMG
- Color
- Black
- Platform
- AR-15
From the manufacturer
CMMG Mk4 Resolute Upper Receiver Group 6.5mm Grendel 16.1in Armor Black. Chambered this upper group is a staple for any collection and comes ready to pair with the AR15 lower group of your choice. Specifications for CMMG Mk4 Resolute Upper Receiver Group: Manufacturer: CMMG Barrel Length: 16.1 in Muzzle Device: CMMG Zeroed Muzzle Brake Color: Armor Black Fabric/Material: Billet 6061 T6 Aluminum Gas Block Journal Size-Diameter: .750 in Gun Rail: M-LOK Gun Type: Rifle Gun Make: CMMG Gun Model: CMMG Mk4 Magazine Included: No Condition: New Package Contents: CMMG Mk4 Resolute Upper Receiver Group What firearm models does the manufacturer say CMMG Mk4 Resolute Upper Receiver Group is compatible with? The manufacturer suggests that CMMG Mk4 Resolute Upper Receiver Group is compatible with CMMG Mk4CMMG 64BCF88-AB: Mk4 Resolute Upper Receiver Group 6.5mm Grendel 16.1in Armor Black
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