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Old 04-11-2019, 08:14 AM
cplnorton cplnorton is offline
 
Join Date: Nov 2011
Location: Van Wert, Ohio
Posts: 2,072
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The OB markings have been observed and known for at least 15 years ever since Jeremy Cheek wrote his article. But they have only been found on the M14's heels like the 0-6X program until this M1911 release.

All available evidence points to Overhauled Barstow and then the year, is the meaning of the mark.

The thought is Barstow switched to marking them OB instead of just the standard O right around 1970+/-, to denote which facility they were rebuilt at.
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