OK, I'm just trying to figure out why the trouble with the barrel nut and wondered if how you had the vise setup had anything to do with it. I just used the Wheeler wrench and a ReactionRod to remove the GI nut on my SIG M400 and had no trouble at all. Did you use your support hand to hold the wrench face tight against the nut to make sure the pins didn't slip out of the nut as you applied force?
Also, the picture of the gas block and tube installed isn't a clamp-on block. It's a set screw block. I think that's why Iraqgunz was asking. If the link below is the block used, the barrel should be dimpled so the set screws can bite in and properly hold the block in place.
https://troyind.com/products/gas-block-750-1
I picked up my ReactionRod in one of Geissele's tool kits, and likewise, they are a dream to use. His gas tube roll pin starter is a pretty slick little tool.
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