They are not that rare, or else TPS would have included a table showing 26" guns. But the "short barrel" list is 24" or less.
26" barrels would not have been considered standard. They would have been specifically ordered that way by the customer. I would say that 26" barrels were more popular in those days than they are today. That may be why finding them pop up from time to time today is not all that uncommon.
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B. Dudley
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