Out of stock
JMac Customs GBC-13 Gas Block w/o Detent Hole, 24mm Threads - GBC-13-WO
Out of stock

JMac Customs GBC-13 Gas Block w/o Detent Hole, 24mm Threads - GBC-13-WO

SKU 51655109043
Brand JMac Customs
Model Number GBC-13-WO
UPC 51655109043
Customers must read Compliance Information before purchasing.

Product Details


Make: JMac Customs
Model: GBC-13 Gas Block
Detent Hole: No
Threads: 24mm


(G)as (B)lock (C)ombo (13) Collab with Sabrewerks13 (Without) detent hole

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
  • 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
  • Weighs 3.59oz


  • Does not include the windage drum, front sight post, or barrel component pins
  • This does NOT have a Detent Hole in the Front


Q & A

Retail Stock


All NFA Rules Apply.
These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.