It could also be some factory anomaly where different barrels were used on a gun. Or even in a case where guns were put together after the fact. Remember that when the factory in Japan stopped production, all of the parts and guns in process were sent back to NJ and a number of guns were assembled after that point by whatever means necessary.
The fact that both barrel sets are milled out and marked the same way may siggest that sort of scenario.
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B. Dudley
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