CMMG Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Armor Black

Name: CMMG Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Armor Black
Brand: CMMG
Availability: InStock

CMMG · Upper Receiver

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Best price

$849.99at OpticsPlanet

In stock Sale checked Nov 5, 2026

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Where to buy

Store	Price	Availability	Buy	Add to build
OpticsPlanet Best price	$849.99Salechecked Nov 5, 2026	In stock	Buy at OpticsPlanet
MidwayUSA	$860.99checked Nov 5, 2026	In stock	Buy at MidwayUSA

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

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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	$860.99	$849.99	$860.99
OpticsPlanet	$849.99	$849.99	$849.99

Since Oct 12, 2026.

About this part

The CMMG Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Armor Black is a 16.1" 5.56 / .223 upper receiver from CMMG. It's sold by 2 stores (2 in stock), from $849.99 to $860.99. The lowest in-stock price in the last 30 days was $849.99 at MidwayUSA.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Barrel length: 16.1" · Handguards

Specifications

Manufacturer: CMMG
Color: Black
Platform: AR-15
Caliber: 5.56 mm NATO

From the manufacturer

CMMG Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 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 55BC7C3-AB: Mk4 Resolute Upper Receiver Group 5.56x45mm NATO 16.1in Armor Black