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Ballistic Advantage 4.5″ 9mm AR 15 Barrel, (Modern Series)

(5 customer reviews)

Original price was: $121.28.Current price is: $69.73.

5 in stock



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 1/2×28 instead of 1/2×36 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 1/2×28 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

Length 4.5″
Material 4150 Chrome Moly Vanadium
Profile Straight
Finish QPQ Corrosion Resistant
Gas System Length Blowback
Gas Block Journal Blowback Gas System – No Gas Block
Twist Rate 1:10 inches
Muzzle 1/2×28 Threaded
Weight 8.1oz


Additional information

Weight 1 lbs
Dimensions 8 × 4 × 4 in

5 reviews for Ballistic Advantage 4.5″ 9mm AR 15 Barrel, (Modern Series)

  1. Jose Castillo (verified owner)

    Very well done. Nice barrel

  2. Nelson (verified owner)

    Pew pew

  3. Karl Watkins (verified owner)

    Great barrel

  4. Barry (verified owner)

    Great barrel at a great price

  5. robertsbcmja (verified owner)

    Love this barrel. I’ve used it on 3 of my 9mm builds and I am impressed.

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