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Bolt Carrier Group AR-15 5 Barrel & BCG Set 9mm

Bolt Carrier Group AR-15 5 Barrel & BCG Set 9mm

CMMG · Barrels

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Best price

$396.99at Brownells

Out of stock checked Oct 22, 2026

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Where to buy

StorePriceAvailabilityBuyAdd to build
Brownells Best price $396.99checked Oct 22, 2026 Out of stock Buy at Brownells
OpticsPlanet $399.99Salechecked Oct 17, 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.

Similar barrels in stock

This part is out of stock at every store we track. These similar barrels are in stock, with today's prices.

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Price history

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

Show the prices as a table
StoreLatestLowestHighest
Brownells$396.99$396.99$396.99
OpticsPlanet—$399.99$399.99

Since Sep 28, 2026.

About this part

The Bolt Carrier Group AR-15 5 Barrel & BCG Set 9mm is a 9mm barrel from CMMG with a carbine gas system. It's sold by 2 stores, from $396.99 to $399.99.

Fits and works with

Caliber
9mm · Shop matching ammo
Bolt
9mm · Bolt carrier groups
Gas system
Carbine · Handguards

Specifications

Manufacturer
CMMG
Platform
AR-9
Caliber
9mm
Gas system
Carbine

From the manufacturer

CMMG's MkGs Barrel and BCG Kit allow you to build a Pistol Caliber Carbine using their Patent Pending Radial Delayed Blowback System. Unlike typical direct blowback systems, our RDB uses a bolt that is forced to rotate and unlock, slowing the BCG. This results in a lighter BCG for a lighter rifle, and less felt recoil than a straight blowback system. CMMG MkG Barrel and Bolt Kits are designed to work exclusively with their MkG Lowers, and a mil-spec upper receiver with enlarged ejection port. Other manufacturers' receivers may work, but CMMG cannot guarantee function or reliability. Barrels are 5a ^2 Medium Taper or 8" Medium Taper 1:10 Twist 414 Mfg: Cmmg

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$396.99 at Brownells
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