Barrel Sub-Assembly 5.56mm - 16.1" Bbl Sub-Assy M4 1-7 1/2-28" Black Nitride

Name: Barrel Sub-Assembly 5.56mm - 16.1" Bbl Sub-Assy M4 1-7 1/2-28" Black Nitride
Brand: CMMG
Availability: InStock

CMMG · Barrels

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Barrel Sub-Assembly 5.56mm - 16.1" Bbl Sub-Assy M4 1-7 1/2-28" Black Nitride

Best price

$176.99at Ammunition Depot

In stock Lowest in 30 dayschecked Nov 13, 2026

Buy at Ammunition Depot

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Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Gas system: Carbine · Handguards
Muzzle thread: 1/2x28 · Muzzle devices
Barrel length: 16.1" · Handguards

Specifications

Manufacturer: CMMG
Color: Black
Platform: AR-15
Caliber: 5.56 mm NATO
Gas system: Carbine
Barrel length: 16.1"
Twist rate: 1:7
Thread pattern: ½ x 28

Where to buy

Store	Price	Availability	Buy
Ammunition Depot Best price	$176.99checked Nov 13, 2026	In stock	Buy at Ammunition Depot
OpticsPlanet	$199.49Salechecked Nov 12, 2026	In stock	Buy at OpticsPlanet
GrabAGun	$179.99Salechecked Nov 12, 2026	Check store	Buy at GrabAGun
Palmetto State Armory	$188.99checked Nov 13, 2026	Check store	Buy at Palmetto State Armory
Classic Firearms	$190.61checked Nov 12, 2026	Check store	Buy at Classic Firearms
CMMG	$199.95checked Nov 13, 2026	Check store	Buy at CMMG
Brownells 17.76% off · ends Nov 15 · exclusions apply	$112.49Salechecked Nov 13, 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

Show

Lowest in-stock price in the last 30 days: $176.99 at Ammunition Depot. Dashed line = out of stock. Tracking since Sep 28, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Ammunition Depot	$176.99	$176.99	$176.99
Brownells	$112.49	$112.49	$112.49
CMMG	$199.95	$199.95	$199.95
Classic Firearms	$190.61	$190.61	$190.61
GrabAGun	$179.99	$179.99	$179.99
OpticsPlanet	$199.49	$199.49	$199.49
Palmetto State Armory	$188.99	$188.99	$188.99

Since Sep 28, 2026.

About this part

The Barrel Sub-Assembly 5.56mm - 16.1" Bbl Sub-Assy M4 1-7 1/2-28" Black Nitride is a 16.1" 5.56 / .223 barrel from CMMG with a carbine gas system. It's sold by 7 stores (2 in stock), from $112.49 to $199.95. The lowest in-stock price in the last 30 days was $176.99 at Ammunition Depot.

From the manufacturer

Perfect for building your custom AR15 upper group. Comes with a properly installed M4 barrel extension. All barrel sub-assemblies are properly headspaced. Chambered in 5.56mm 16.1" Barrel Length M4 and Lightweight Tapers Carbine Gas System Length A 1/2-28 Threads 1-7 Barrel Twist Salt Bath Nitride Finish Mfg: Cmmg