Ballistic Advantage Modern Series Barrel 9mm 5.5 inch Straight 1-10 Twist Black
$99.75 at OpticsPlanet
In stock Sale
Best price
$99.75at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- Ballistic Advantage Modern Series Barrel 9mm 5.5 inch Straight … $99.75at OpticsPlanet
- AR-15 Modern Series 12.5 Carbine Barrel Gov'T $93.12at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet Best price | $99.75Salechecked Oct 22, 2026 | Out of stock | Buy at OpticsPlanet | |
| Brownells | $99.99not checked recently | 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.
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.
AR-15 Modern Series 12.5 Carbine Barrel Gov'T
$93.12 at OpticsPlanet · 7 stores
In stock Sale
Price history
Lowest in-stock price in the last 30 days: $99.75 at OpticsPlanet. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $99.75 | $99.75 | $99.75 |
Since Sep 28, 2026.
About this part
The AR-15 Modern Series 4.5 Barrel is an AR-15 barrel from Ballistic Advantage. It's sold by 2 stores, from $99.75 to $99.99. The lowest in-stock price in the last 30 days was $99.75 at OpticsPlanet.
Specifications
- Manufacturer
- Ballistic Advantage
- Platform
- AR-15
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 instead of 1/2x36 to give you greater versatility when choosing a suppressor.
Integrated feed ramp and barrel extension.
Since the “barrel extension” is an integral part of the barrel, the length stated is the true overall length. For example, an 11” 9mm barrel has the same outer dimensions/length as a 10.5” 5.56 barrel.
IMPORTANT: A standard 1/2x28 flash hider will not have enough clearance for a 9mm round to pass.
Before installing a muzzle device, ensure a 9mm round will drop freely through the muzzle device bore.
You may use this barrel with a lower receiver that is a Registered SBR, Machine Gun, or Pistol. Possession of this barrel along with a Non-NFA lower receiver is Prohibited, except when installed on a Pistol configuration firearm.
Additional Info
- Material: 4150 Chrome Moly Vanadium
- Finish: QPQ Corrosion Resistant
- Gas System Length: Blowback
- Gas Block Journal: Blowback Gas System - No Gas Block
- Twist Rate: 1:10 inches
- Muzzle: 1/2x28 Threaded
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