For the most part it appears that guns G grade or below were largely, not always but largely, ordered as stock items. According to TPS you didn't get into truly custom order guns until you hit D grades. I believe this coincides with the statement that typically letters don't show a specific name of a person who ordered the gun unless it is D or higher.
One of our more learned members can correct me if I have any of that wrong.
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"The Parker gun was the first and the greatest ever." Theophilus Nash Buckingham
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