Brian, the "B" for ball grip is seen many times in later guns. If you want examples, read the list of .410 guns in the Appendix of TPS. After reading tens of thousands of order book entries, I have never seen an entry for "Uncapped Pistol Grip". True, many stock book entries for grip types do not agree with the actual gun, especially in the IBM card era. It is obvious to me that the transcribers of the records to the Serialization Book used a default entry because many cards did not mention a grip type.
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