So I'm building my accuracy driven AR. I bought a 20 inch WOA varmint contour barrel. It came with the match rifle Gas block. Gas block is really snug. I put the barrel outside for a few and put the gas block in my old toaster oven. Slips right on. But my question is...does the gas block snug right up to the end of the GB journal or is there some space in between? Tried measuring the gas block but done have a tape measure small enough to fit in it tried going on WOA we sit but they didn't have anything about it that I could see. Thanks