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.