JMac - MDi-co

GBC-13 - With Detent Hole

(4 Reviews)
Current Stock:
3.52 Ounces




(13) Collab with Sabrewerks13

(With) detent hole


PLEASE READ THIS FIRST: These come stripped, they do not include the windage drum, front sight post, detent, spring, or barrel component pins.

If you would like those items click on the links below and add them to your cart. 

This HAS a detent hole in the front

These will be available in large quantities for AK manufactures, send an email to for inquires 

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 
  • 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.


It all started with a high definition scan of an original part from Larry Vickers, then we teamed up with Sabrewerks13 to oversee the casting process, and finally back to us for machining. 

Reviews (4)


Written by Dale Henderson on Aug 2nd 2021

Awesome piece! Really added some character to my build. Amazing quality! Do not hesitate to buy.


Written by Jeremiah Johnson on Feb 4th 2020

Superb quality casting and machining as well as the finish and fits the jmac barrels perfect.

Excellent product

Written by Michael Griffith on Mar 15th 2019

Bought this gas block for a custom 5.56 build I am doing. Not only does is look great, it is a very high quality part! Love it, 10/10 would buy again!

Excellent product

Written by Michael Griffith on Mar 4th 2019

just received my GBC-13 and will be using it on a 5.56 pistol build. This is a beautifully made product!

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