Tuning Factory cricket barrel tread..?

Found that the bullpub tread is Vulcan treads or m-14-1 ... you could actually just put a donny moderator with the Vulcan treads....now I need to know what is the tread # for the cricket carbine barrel ,the treads are not the same, they are a bit thinner n they are not 1/2 because a standard moderator 1/2-20 don't even enter the thickest of the barrel..
 
20201225_125856.1608949552.jpg
the new carbine barrels are treaded but is a thinner tread .. the top one is m14-1.25 ---- the lower one I can't find it anywhere.