Since the first announced the GBC-13 combo, people have asked if there was going to be a version of the gas block with 24mm threads, well here is the solution!
What you're looking at is a press and pin thread conversion for non-threaded barrels to be used with the GBC-13 or even separate! This presses and pins in place just like any barrel component and will come in multiple ID sizes. This will also allow you to use the detent in the GBC-13 for 24mm devices!
Choose the size based on your barrel diameter where you plan on installing
This will come with a drill bit and pin for installation!