AR-15 Modern Series 5.5 Barrel
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specifications

Manufacturer:

Ballistic Advantage

Platform:

AR-9

Caliber:

9mm

Thread Pattern:

½ x 28

    AR-15 Modern Series 5.5 Barrel

    Caliber Manufacturer Color Weight Merchant Price Merchant URL
    9mm Ballistic Advantage None None None $83.99 Brownells Add

    Prices last checked September 2026. Prices and availability change often, so confirm on the retailer's site.

    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

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