I don't have it on a blueprint yet, it's still in my head at this point. I am trying to remember who it was here who built their own adjustable gas block and came straight out of the block with an unbent gas tube. I wanted to follow a similar pattern, but it may not be strictly necessary. I suppose what I need to do is look at the largest common size gas block bore (.937 - .940 probably) and see how close the bore for the gas tube is in relation. So if anyone has a GB for a .936 gas shoulder and you can take a picture and or measure the difference between the bores, that would be helpful.