AR-15 Modern Series 5.5 Barrel

Name: AR-15 Modern Series 5.5 Barrel
Brand: Ballistic Advantage
Availability: InStock

Ballistic Advantage · Barrels

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Best price

$83.99at Brownells

In stock Sale checked Oct 21, 2026

Buy at Brownells

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Where to buy

Store	Price	Availability	Buy
Brownells Best price	$83.99Salechecked Oct 21, 2026	In stock	Buy at Brownells
Ammunition Depot	$99.75checked Oct 11, 2026	In stock	Buy at Ammunition Depot
Battlehawk Armory	$77.27Salechecked Oct 12, 2026	Check store	Buy at Battlehawk Armory
Palmetto State Armory	$93.99checked Oct 10, 2026	Check store	Buy at Palmetto State Armory
OpticsPlanet	$99.75Salechecked Oct 21, 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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Lowest in-stock price in the last 30 days: $83.99 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Ammunition Depot	—	$99.75	$99.75
Battlehawk Armory	—	$73.73	$77.27
Brownells	$83.99	$83.99	$83.99
OpticsPlanet	$99.75	$94.76	$99.75
Palmetto State Armory	—	$93.99	$93.99

Since Sep 27, 2026.

About this part

The AR-15 Modern Series 5.5 Barrel is a 9mm barrel from Ballistic Advantage. It's sold by 5 stores (2 in stock), from $77.27 to $99.75. The lowest in-stock price in the last 30 days was $83.99 at Brownells.

Fits and works with

Caliber: 9mm · Shop matching ammo
Bolt: 9mm · Bolt carrier groups
Muzzle thread: 1/2x28 · Muzzle devices

Specifications

Manufacturer: Ballistic Advantage
Platform: AR-9
Caliber: 9mm
Thread pattern: ½ x 28

From the manufacturer

This 9mm chambered 4.5 inch Modern Series Barrel is machined from 4150 Chrome Moly Vanadium steel with a QPQ Corrosion Resistant Finish and 1/2-28 x .400 full profile threads. Designed to work with both Colt/RR and Glock style AR builds. Compatible with standard mil-spec uppers. There are also numerous dedicated 9mm upper options that work. Requires the use of a unique magwell conversion (Colt/Rock River style) with UZI mags or a dedicated 9mm lower with Glock mags. 9mm on an AR15 platform operates by blowback and does not need a gas block or gas tube. Threaded 1/2x28 or 1/2x36 to give you greater versatility when choosing a suppressor. Integrated feed ramp and barrel ex Mfg: Ballistic Advantage