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9/19/2017 7:27:10 PM
Posted: 10/17/2003 10:24:20 PM EDT
If I understand correctly, headspacing is enforced by the relationship between the barrel and the bolt assembly and has nothing to do with the upper. Am I understanding correctly?

The reason I ask is because I'm thinking about replacing my upper. I think I would be okay with swapping my barrel from the old one to the new one, but if there is the chance of headspacing changing, I would probably want a qualified gunsmith to check it for me.
Link Posted: 10/18/2003 12:33:00 AM EDT
The headspace cannot and will not change with a new upper. Do it your self. Save your cash.
Link Posted: 10/18/2003 4:36:40 AM EDT
As you note yourself the headspace is determined purely by the mechanical relationship between the bolt and the barrel. On the M16 system the locking lugs are a permanent part of the barrel and wherever the barrel goes, they go. The receiver just holds the parts steady and doesn't figure at all into the headspace question. -- Chuck
Link Posted: 10/18/2003 6:06:13 AM EDT
Thanks, that's what I thought. :)
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