Mr. Kemp:
I do what the customer wants. For barrel tenons on barrels of 1.200 or 1.250 I turn the tenon about an extra .010 so I have some room for adjustment and the barrel nut has no frontal interfearance. The barrel nut does not affect accuracy. It just makes it so any monkey can head space the rifle in 25 seconds. Time is money in gun making.
Nat Lambeth