Barrel Sub-Assembly 300 Blackout - 16.1" Bbl Sub-Assy Medium Taper 1-7 5/8-24" Bbss

Name: Barrel Sub-Assembly 300 Blackout - 16.1" Bbl Sub-Assy Medium Taper 1-7 5/8-24" Bbss
Brand: CMMG
Availability: OutOfStock

CMMG · Barrels

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Best price

$172.99at Brownells

Out of stock checked Oct 1, 2026

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Where to buy

Store	Price	Availability	Buy	Add to build
Brownells Best price	$172.99checked Oct 1, 2026	Out of stock	Buy at Brownells
OpticsPlanet	$193.99Salechecked Oct 1, 2026	Out of 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

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

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Store	Latest	Lowest	Highest
Brownells	$172.99	$172.99	$172.99
OpticsPlanet	$193.99	$193.99	$193.99

Since Sep 28, 2026.

About this part

The Barrel Sub-Assembly 300 Blackout - 16.1" Bbl Sub-Assy Medium Taper 1-7 5/8-24" Bbss is a 16.1" 300 Blackout barrel from CMMG with a carbine gas system. It's sold by 2 stores, from $172.99 to $193.99.

Fits and works with

Caliber: 300 Blackout · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Gas system: Carbine · Handguards
Muzzle thread: 5/8x24 · Muzzle devices
Barrel length: 16.1" · Handguards

Specifications

Manufacturer: CMMG
Platform: AR-15
Caliber: 300 Blackout
Gas system: Carbine
Barrel length: 16.1"
Thread pattern: 5/8 x 24

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 .300 Blackout 16.1" Barrel Length Medium Taper Contour Carbine Gas System Length 5/8-24 Threads 1-7 Barrel Twist Available in a Bead Blasted Stainless Steel or Salt Bath Nitride Finish Mfg: Cmmg