Resolute Mk4 5.56NATO Assembl Upper 14.5"bbl W/P&W Brake BLK

Name: Resolute Mk4 5.56NATO Assembl Upper 14.5"bbl W/P&W Brake BLK
Brand: CMMG
Availability: OutOfStock

CMMG · Upper Receiver

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Best price

$524.99at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$524.99checked Oct 1, 2026	Out of stock	Buy at Brownells

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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Dashed line = out of stock. Tracking since Sep 28, 2026.

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Store	Latest	Lowest	Highest
Brownells	$524.99	$524.99	$524.99

Since Sep 28, 2026.

About this part

The Resolute Mk4 5.56NATO Assembl Upper 14.5"bbl W/P&W Brake BLK is an AR-15 complete upper receiver from CMMG. One store lists it, Brownells at $524.99.

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: 14.5" · Handguards

Specifications

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

From the manufacturer

CMMG MK4 5.56x45MM NATO ASSEMBLED UPPER RECEIVER W/PINNED & WELDED MUZZLE BRAKE The carbine upper that keeps it simple. Chambered in 5.56x45mm, this RESOLUTE upper group's 14.5" barrel comes with the ZEROED SVD muzzle brake pinned & welded to the muzzle. This is the perfect choice when you want to go as short as possible while still meeting overall length requirements for rifle barrels, so no NFA rules or SBR registration. This upper group does NOT include BCG or charging handle. FEATURES Platform: Mk4 Caliber: 5.56x45mm Operating System: Direct Impingement Barrel Length: 14.5" Barrel Twis Mfg: Cmmg