The standard large shank barrel nut has a smaller ID than 1.25" so I would be of the opinion that either your gunsmith modified the barrel nut or the barrel steps up out past the nut. I've asked Josh at Criterion how they made this heavy barrel offering possible and he stated that the barrel nut is modified.
I'm interested to hear how yours was done and how they shoot? Do you like the 1.25" barrel profile and was it difficult to tune?
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