Griffin Armament HEDP Barrels

There is a mental and physical checklist that shooters should run through before running their rifle suppressed. First off, do you have a suppressor? Great, one major hurdle down. Next in line should be preparing your host weapon for its new role as a silenced blaster. Concentric muzzle threading and for the Ar15 platform, proper gas mitigation is at the top of the list. Supppressor manufacturer Griffin Armament has solved these issues and more with the release of their HEDP suppressor-ready barrels.

The Griffin HEDP™ Barrels provide High Endurance Dual Purpose functionality- offering high durability and precision accuracy. Nitrided 416R stainless steel provides the highest possible hardness and longest throat life available with match grade bore dimensions and bore finish. HEDP barrel bores are hand lapped, ensuring batch to batch consistency and accuracy. TRUE-BORE™ concentric suppressor grade threads provide an optimized thread interface for your silencer regardless of brand or model. M4 feed ramps and chambers are polished prior to nitriding for smooth reliable feeding, chambering, and extraction. Gas ports were carefully engineered to provide reliable function suppressed or unsuppressed with 5.56 NATO ammunition. M4A1 contour diameter between the chamber and gas block for minimal POI shift with suppressors and maximum accuracy and durability while maintaining field weight. The included 416R Low profile Griffin Armament Primo gas Block™ offers unmatched value in the interest of increased customer satisfaction. Threads are slotted for pinning and welding your favorite Griffin Armament muzzle device.


Griffin Armament @ TFB

Griffin Armament HEDP Barrel

  • 416R SS barrel manufactured from stress relieved certified barrel steel
  • Black nitrided for extended service life
  • Magnetic particle inspected
  • Button rifled
  • 223 Wylde chamber for optimal accuracy
  • Mid length gas for softer recoil characteristics
  • .750″ gas block journal
  • M4A1 diameter for reduced POI shift / Increased Accuracy & Durability
  • Air gauged and hand lapped bore
  • Polished chamber and M4 feed ramps
  • TRU-BORE™ suppressor quality threads
  • Suppressor optimized gas ports
  • .625″ , 1/2×28 industry standard threads
  • threads pre slotted for pin and weld applications
  • Included 416R Low Profile PRIMO Gas Block™


Griffin Armament – HEDP Barrels


LE – Science – OSINT.
On a mission to make all of my guns as quiet as possible.
Twitter: @gunboxready
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  • lol

    So it’s a regular barrel advertising what is essentially quality control on a stainless match barrel, sold by a suppressor manufacturer that may or may not have a reduced sized gas port.

    I think I’ll stick with reputable barrel manufacturers and adjustable gas blocks…

    • JumpIf NotZero

      Nailed it.

    • thedonn007

      The pre sloted threads only further killed it for me.

    • Sledgecrowbar

      What’s the difference between suppressor-grade threads and regular threads? About $265.

  • Christian Hedegaard-Schou

    High Explosive Dual Purpose?

    I don’t want a Highly Explosive barrel. In fact, that’s the exact OPPOSITE of what I want.

    • yodamiles

      Seriously dude, what’s not fun about spraying hot metal fragmentation all over yourself and your neighbors?

      • Gary Kirk

        I get enough hot metal fragments at work welding..

    • VanDiemensLand

      H Endurance D P

      • Sunshine_Shooter

        You missed the joke.

  • Hoplopfheil

    Huh. The low pro gas block on my AR seems to stay put without the dimples. Looks nice though.

    • BillC

      Oh gawd. Well, good for you.

      • Hoplopfheil

        Settle down, Mr. Bale.

    • Flounder

      It’s just a nice touch. It’s one small thing that the manufacturer put there because they care about you. XD kinda joking but at the same time of all the things to be annoyed by why that?

      • Hoplopfheil

        Not annoyed, I actually think it’s cool.

        BUT it’s an added cost, and I can’t say I’ve ever felt the need for it. Like I said, I have a low pro set-screw gas block on my AR (both actually) and have never had it move on me.

        So for me personally, I wouldn’t spend extra on that feature.

    • Sunshine_Shooter

      You sure your barrel isn’t dimpled? How hard have you been on that barrel? Did you torque the set screws super tight?

  • Maximilian Johannes Benning

    What might be good about this is the pre-slotting for pinning and welding, that means that Griffin won’t void your warranty if you pin and weld a muzzle application?

  • MrStorm

    I’m just waiting for Griffin Armament to release a one stamp upper

  • AndyT

    I don’t see this is any better than a green mountain barrel. Also likely twice the price.

  • ??
  • Emperius

    Anybody know of any barrel that is cold hammer forged and nitrided at 10.5″ or 11″?
    APOC Armory and SAND Hammer Forging offer these features but none have it in carbine lengths.

    • Gary Kirk

      Only ones I know of are Daniel defense.. But they’re 16″.. Sorry

  • DAN V.

    HEDP = high explosive dual purpose

    • Guest

      High endurance double penetration. Use both ends for long periods of time