It looks like the barrel nut has a small hole that aligns with a detent drilled in the barrel.
Tighten the nut and lock it in place by stamping the smaller outer hole into the larger detent?
I'd assume corporate doesn't want the consumer to re-barrel the rifle.

"Camping places fix themselves in your mind as if you had spent long periods of your life in them.
You will remember a curve of your wagon track in the grass of the plain like the features of a friend."
Isak Dinesen