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Posted: 10/13/2004 9:45:43 AM EDT
[Last Edit: 10/13/2004 9:46:14 AM EDT by chewbacca]
I have heard this is a big no no, I have it is usually OK and I have heard there is absolutely no problem...all from this site. So question is, what is the truth? Can somebody back up their opinion with some kind of concrete data; because I have noticed that most "data" is rather just perpetuated hear-say...

TIA
Link Posted: 10/13/2004 10:39:59 AM EDT
You can do it - no problem. However, you will accelerate the wear of the bolt & locking lugs. Check headspace with a USGI Field Gauge everytime you switch to ensure safety.
Link Posted: 10/13/2004 10:49:13 AM EDT
I posted this in another thread but figured I would ask here to since people where on the subject.

I am taking my barrel off my upper in order to thread it, do I need to check headspacing when I reassemble it? (Its a chrome lined Bushy Barrel if that matters.)
Link Posted: 10/13/2004 12:08:58 PM EDT
I raised this very question in an earlier thread because the USMC tech manual for the M16 warns repeatedly not to swap bolts from one rifle to another or in this case from one upper to another. One of the members who replied to my questions cited an example of perhaps moving the bolt from a hi milage barrelel upper to a low mileage barrled up could cause head space problems and lead to a KB.
Link Posted: 10/13/2004 1:03:14 PM EDT
Forest, where do I get a GI gauge?
Link Posted: 10/13/2004 1:34:16 PM EDT

Originally Posted By jcovercash:
I am taking my barrel off my upper in order to thread it, do I need to check headspacing when I reassemble it? (Its a chrome lined Bushy Barrel if that matters.)



No you don't need to recheck headspace. Headspace is determined by the barrle extension's interface to the bolt. So as long as you are using the same bolt & barrel the headspace doesn't change.
Link Posted: 10/13/2004 1:35:15 PM EDT

Originally Posted By chewbacca:
Forest, where do I get a GI gauge?


I bought mine from Fulton Armory. It comes in a foil pouch with a calibration card.

Not only is the GI gauge the proper size for the M16 chamber - but it doesn't require you disassemble the bolt (like the civilian gauges do).
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