I agree that there COULD BE 2 specs. But I can't find that THERE IS; for the production issues I already listed.
What you just posted says someone suspected that given there was no standard in the mid 60's, there COULD have been a connection. Fine enough conclusion to draw. But that is an unsupported conclusion, and still not evidence of two separate specs.
An interesting tell in the photo is this quote:
"In his eagerness to be heard at last, and with the benefit of hindsight, Dr. Carten's CASE History consisted largely of scathing but not entirely fair criticisms".
The AR-15 link you posted is a general page. If they are a reference for you, let's work with that. Use your link and click on the "Faq" tab, you get here:
http://www.ar15.com/content/page.html?id=406
Where you scroll down a tad and they tell you this:
Q: What is the difference in 5.56X45 NATO and .223 Remington brass? I can't find dies for 5.56 NATO cartridges.
A: The brass for both catridges is identical (except for the primer crimp in the military surplus brass), the chambers are slightly different. The throat of a 5.56X45 chamber is slightly longer than the SAAMI standard for .223 Remington. Refer to the Ammo Oracle for more details. Buy dies for .223 Remington.
That reference confirms that the brass indeed IS the same.
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