Hodge Defense 12.5″ (Large Port) Government Carbine Barrel 5.56mm | HDSI Barrel

MSRP: $425.00
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These have a 0.0645″ gas port. The standard HDSI 12.5″ barrel has a 0.0625″ port which is optimized for traditional suppressors and M855A1 ammo.

The large port barrels are better suited for a wide variety of ammo and non-suppressed or flow through suppressed use. 

(10 customer reviews)

9 in stock

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Hodge Defense 12.5″ 5.56mm Carbine Barrel is the barrel used on the Hodge AU Mod 2 rifles. Incorporating FN’s proprietary steel (the same steel used in the M249 saw), these barrels were designed and made to Jim’s specifications and optimized for the  M855A1 EPR ammunition, which is far more demanding on barrels.

M855A1 rounds operate at about 62,000 PSI (over 55k from M855) and are designed to perform to an expected standard of terminal performance and barrier penetration over a broader range of engagement distances, previous ammunition was criticized for being unstable and not providing consistent performance outside of a narrow optimal range.

The AU Mod 2 is optimized for running M855A1 EPR, and this Hodge barrel is at the heart of the system.

  • Proprietary midweight profile (close to Government profile)
  • Military spec gas port optimized for use with 5.56 NATO spec ammo and suppressors
  • .750″ gas block journal
  • Standard carbine gas system
  • 1/2×28 threaded
  • Chrome lined, phosphate coated
  • 1lb 8oz in weight
  • 1:7 twist
  • M4 feed ramps
  • Made in the USA
  • 0.0645″ Gas Port

Once this barrel is assembled into a complete firearm, it becomes a regulated item by the National Firearms Act (NFA). Check with your local and state laws for any further regulatory requirements. The buyer is responsible for compliance of all NFA rules and applicable laws.


Additional information

Weight 8 oz
Dimensions 14 × 4 × 4 in

10 reviews for Hodge Defense 12.5″ (Large Port) Government Carbine Barrel 5.56mm | HDSI Barrel

  1. CalicoJosh (verified owner)

    I absolutely love this barrel. It runs superbly unsuppressed and even with the “large port” I get consistent 2:30 – 3:00 ejection running suppressed with my Sandman S and an H2. 1500 rounds in so far and I am very pleased. I’ll be picking up another in 14.5 flavor as soon as I can!

  2. patricktfrasier (verified owner)

    It’s FN Hodge! Get it?? But in all seriousness is shoot mostly unsuppressed. From what I hear and read this shoots beautifully suppressed anyway. Keeping an eye out for the smaller port though because options are nice.

  3. malvarez115 (verified owner)

    large port 12.5 is where its at

  4. Zach (verified owner)

    These barrels are excellent!

  5. malvarez115 (verified owner)

    large point made me do it.

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