Resolute Mk4 5.56 NATO Assembled Upper Rcvr 16.1" Bbl Black

Name: Resolute Mk4 5.56 NATO Assembled Upper Rcvr 16.1" Bbl Black
Brand: CMMG
Availability: InStock

CMMG · Upper Receiver

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Best price

$489.99at OpticsPlanet

In stock Sale checked Oct 2, 2026

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Where to buy

Store	Price	Availability	Buy
OpticsPlanet Best price	$489.99Salechecked Oct 2, 2026	In stock	Buy at OpticsPlanet
Ammunition Depot	$493.49checked Oct 2, 2026	In stock	Buy at Ammunition Depot
Sportsman's Warehouse	$559.95checked Oct 2, 2026	In stock	Buy at Sportsman's Warehouse
Brownells	$595.38checked Oct 2, 2026	In stock	Buy at Brownells
Palmetto State Armory	$574.99Salechecked Oct 2, 2026	Check store	Buy at Palmetto State Armory

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: $489.99 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Ammunition Depot	$493.49	$493.49	$493.49
Brownells	$595.38	$595.38	$595.38
OpticsPlanet	$489.99	$489.99	$489.99
Palmetto State Armory	$574.99	$574.99	$574.99
Sportsman's Warehouse	$559.95	$559.95	$559.95

Since Sep 27, 2026.

About this part

The Resolute Mk4 5.56 NATO Assembled Upper Rcvr 16.1" Bbl Black is an AR-15 complete upper receiver from CMMG. It's sold by 5 stores (4 in stock), from $489.99 to $595.38. The lowest in-stock price in the last 30 days was $489.99 at OpticsPlanet.

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
Type: Complete
Platform: AR-15
Caliber: 5.56 mm NATO
Barrel length: 16.1"

From the manufacturer

CMMG RESOLUTE MK4 5.56X45MM NATO ASSEMBLED UPPER RECEIVER Top off your next build with this RESOLUTEA(R) Mk4 Upper Group. Chambered in 5.56x45mm, this upper group is a staple for any collection. This upper group does NOT include BCG or charging handle. SPECS Platform: Mk4 Caliber: 5.56x45mm Operating System: Direct Impingement Barrel Length: 16.1" Barrel Twist: 1:7 Barrel Contour: MT Barrel Material: 4140CM, SBN Muzzle Device: CMMG A2 Flash Hider Muzzle Thread: 1/2 x 28 Gas Port Location: Mid Gas Block: Non-Adjustable 0.750" Upper Receiver: Billet 6061 T6 Alu Mfg: Cmmg