I would like have a spare barrel for my semi-auto Bren III and be able to change barrels as quickly as possible. I really don’t want to change the locking shoulder every time I change barrels.

Does the barrel nut have an effect on the CHS?

I checked the barrels I have and didn’t have any luck finding one that would headspace with the nut that’s on the gun. Now I am wondering if I might get lucky and find a barrel and nut combination that would headspace without having to change the locking shoulder or does it not work that way?
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