I can understand why folks are often in a hurry to find out the details of “their gun,” but this is the reason that the research often takes what must seem as overlong time.
The records in question are shipping records, as any production records that might have been are long gone. As has been pointed out, they are not yet computerized, and only exist in hand-written ledgers – some going back to the Civil War.
Revolvers were not shipped in any numerical order, and some went out years after they were made. Also during wartime, mixed serial numbers over a wide range were often the case.
So sometimes by coincidence a number is found quickly, while in other instances it’s a case of finding a needle in a haystack. Then after the information is located it must be written up in a formal letter and mailed out.
It takes a very special person (and Roy Jinks is indeed an individual that meets that description), to go through what can be a considerable amount of work to find the answers.
Eight to ten weeks isn’t unusual, and longer is quite possible considering the number of requests that pour in. We are lucky that this kind of service is available at all.