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5.5″ Epc 9mm Straight 4150 Cmv, Blowback, 1:10, 1/2×28 (Modern Series)

(9 customer reviews)


1 in stock



This 9mm chambered 5.5 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.
  • Enhanced Feed Ramp
  • 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.

Length 5.5″
Material 4150 Chrome Moly Vanadium
Profile Straight
Finish QPQ Corrosion Resistant
Twist Rate 1:10″
Gas System Length Blowback
Gas Block Journal Blowback Gas System – No Gas Block
Muzzle 1/2×28 Threaded
Weight 9.6oz
Other Info Enhanced Feed Ramp



Additional information

Weight 1 lbs
Dimensions 8 × 4 × 4 in

9 reviews for 5.5″ Epc 9mm Straight 4150 Cmv, Blowback, 1:10, 1/2×28 (Modern Series)

  1. curtis m. (verified owner)

    I haven’t got chance to try out new build yet but bkings is great have confidence when buying from bkings great customer services.

  2. Cesar (verified owner)

    Fast shipping great pricing and quuality product

  3. Daniel P. (verified owner)

    Price was right. Once in a blue moon you’ll see this barrel for about $80 shipped, that’s the price B Kings had during a sale. Very easy checkout, fast shipping during this quarantine panic. Shipped well packed. No complaints!

  4. Robert McCarthy (verified owner)


  5. Anthony N. (verified owner)

    Great quality barrel and perfect for my PCC!

  6. David Reid (verified owner)

    High quality barrel for an outstanding price.

  7. MICHAEL MITCHELL (verified owner)

  8. John R. (verified owner)

    Haven’t shot it yet, but the finish was solid

  9. Justin R. (verified owner)

    Arrived fast and in perfect shape.

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