JMAC CUSTOMS GBC-13 FRONT SIGHT/GAS BLOCK COMBO WITH DETENT

JMac Customs GBC-13-With Detent Hole

This does have a Detent Hole in the Front

• 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 gunsmithing
• Uses standard front sight windage drum and pin
• Available with detent and spring at 12 o'clock location
• 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

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

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 JMac Customs for machining.