IMHO, the only problem with chambering the barrel "without" the nut? If you want to swap barrels, it has to be headspaces on a lathe. (back to the gunsmith!!)
The advantage of the barrel nut and floating bolt head is you can do it yourself. (if you're so inclined)
Don't like the caliber it's chambered in or want to try something else? Brake the nut loose, swap the pre chambered barrels and bolt head if needed, set the headspace and go shooting. And no waiting till the smith has time.
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