NEW: Definitive Arms Adjustable AK Gas Block

Definitive Arms has released several images of their new adjustable gas block for AK rifles. It has 13 settings and the way you change them is pretty AK-style. The retention of the gas block positions is accomplished by a spring loaded plunger and corresponding cuts on the selector drum which is very reminiscent of muzzle device retention mechanism of AK rifles.

These new gas blocks will be compatible with a number of AK family rifles – AKM, AK-74, 100-series AKs, Veprs, RPK etc. The complete compatibility list and the pricing information will be available later. There will be two versions of this gas block – gas block only and a gas block/front sight combo.

Definitive Arms points out that this gas block could be especially useful for building an AK in some exotic (not normally seen in AKs) calibers. Tim of Military Arms Channel has also released a short video telling about this gas block where he says that it also can be handy for use with suppressors.

I’d agree with both the statements. Other than the mentioned cases, if you are going to use your AK as it is, there is perhaps no need for such an advanced gas block. AKs are normally overgassed and it is ok. They are designed so and that is one of the reasons of their reliability in different environmental conditions and with different ammunition.

Hrachya H

Being a lifelong firearms enthusiast, Hrachya always enjoys studying design, technology and history of guns and ammunition. His knowledge of Russian allows him to translate and make Russian/Soviet/Combloc small arms related information available for the English speaking audience.
Should you need to contact him, feel free to shoot him a message at


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    • SGT Fish

      probably the same reason that the gas block is still in raw metal and not finished. they were just mounting it to test and for pics. Why install a front sight when you are just going to remove it to take the gas block off anyway

    • Matt

      You don’t need a front sight for a suppressed gun, just strap on the rear pic rail and gooooooo.

      • Anonymoose

        You would want a detent or a threaded FSB (24×1.5RH) since tightening your suppressor on a 14x1LH AK might loosen your muzzle device.

  • Petto

    Nice idea but you can’t really change the gas block on AKs that easily , it’s almost like getting new barrel in.
    On the other hand on New build Aks this will be very good option if you plan to suppress it

    • Dan

      It’s not that bad. Remove brake, drive out the pins and pound off the gas block with a brass or aluminum block and hammer. Definitely helps to have tools and a jig for drilling the new pin holes, but if 11-year old kids in the Khyber Pass can do it…

      • Jeff Smith

        Sadly, most things involving tools and a firearm is out of the comfort zone of a majority of firearms users.

      • Ken

        How about Dremel off the old gas block, cut off the bottom of this one, and then braze or weld it to the barrel over the gas port?

        • Mike Cramer


  • Spencer W
  • Jtx

    Now let’s make something of similar function and durability for ar15s all the gas blocks on market for them suck they don’t keep their setting and are difficult to set

    • mig1nc

      Not the MicroMOA. I love mine. But sadly they are (temporarily?) out of business. I’ve heard the Noveske switchblock is solid as well.

  • Ken

    It needs a bayonet or grenade launcher lug on the bottom, principle of the matter. Evil features scare gun grabbers.

  • BrandonAKsALot

    Good new for my 6.5 Grendel RPK build. This makes my life a lot easier. I won’t have to potentially drill out or remove the gas block if I’m not getting enough gas.

  • SandMouse

    This is basically a slightly more complicated version of the Zastava PAP M90NP’s adjustable gas block. Still nice though.