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Iron Curtain Customs

GBC-13 Gas Block - With Detent Hole - Adjustable

GBC-13 Gas Block - With Detent Hole - Adjustable

Regular price $129.95 USD
Regular price Sale price $129.95 USD123
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(G)as(B)lock(C)ombo(13) Collab with Sabrewerks13

(With) detent hole

The intended purpose of these is to adjust the amount of gas going into the system. Once you have achieved the optimal amount of gas we recommend using rockset or loktite to maintain the position.PLEASE READ THIS FIRST: These come stripped, they do not include the windage drum, front sight post, detent, spring, or barrel component pins.

This HAS a detent hole in the front

GBC-13 is a copy of the East German 74nk Front Sight Gas Block Combo

  • Perfect for Pistol, SBR, and Rifle builds to lighten up the front end and give it a custom look
  • Fits common 0.591" gas block barrel journals
  • Adjustable Set Screw
  • Has 90* gas port and is a direct replacement for most 90* gas blocks, will work on 45* gas ports with minor gun-smithing
  • Uses standard front sight windage drum and pin (available for purchase here - Windage Drum Front Sight Post)
  • Available with detent and spring at 12 o'clock location (available for purchase here - Spring and Detent) (accepts standard AKM spring and detent)
  • Has built in cleaning rod holder
  • Cast in the US using Wax Casting techniques similar to the modern Russian barrel components
  • Machined in the US
  • 4140 Heat Treated to Rockwell 32C
  • Black Nitrided in the US

We recommend having a Kalashnismith install.

Owned and operated by gun enthusiasts.

Building guns is what we love to do, and it shows in the finished product. We are not a retail outlet selling firearms right out of the box. Just isn’t the Iron Curtain Customs way of life.

We share the same enthusiasm.

Oftentimes we look at a completed project and say ....”I want one!!” So we share the same enthusiasm as you when it comes to having a firearm you can be proud to own, love to brag on, and share with your buddies.


20 Years of Experience

After nearly two decades in the industry there are thousands of guns out there that started with humble beginnings in our shop. We will give you the best advice and let you make your own decision as to the direction of your project.

Commitment to Service

Ultimately you, the end user is what matters the most. We challenge ourselves to make firearms that in some form or another haven’t been done before. Whether it’s a small modification or a major mashup…we completely accept the challenge. All of our work comes with a lifetime warranty. We completely stand behind everything we build.