I've corresponded with the Rock Island Arsenal regarding our mystery gun. The reply I received is reproduced below:
"I do have information on Russell West. According to his obituary, he had a
very interesting federal career in addition to being responsible for the
museum near the end of his career.
"The only early documentation of the contents of the museum was a catalog that
was published in 1909, "Catalogue of the Ordnance Museum, Rock Island Arsenal,
Rock Island, Ill." It can be found online:
Descriptive Catalogue of the Ordnance Museum, Rock Island Arsenal
"I suggest that you look through this catalog to see if the weapon appears in
the catalog.
"The Rock Island Arsenal was the repository for all types of military
equipment, including small arms, in its early history. Unfortunately, we
don't have any documents concerning what was stored here. Many items that
were stored here were sold at auction, and Bannerman's was fairly consistent
customer. Bannerman's, as you probably know, had a military resale shop in
New York City and sold obsolete military equipment through published catalogs.
"If you would like copies of what information I have on Russell West. Please
let me know."
Kris Gayman Leinicke
Museum Director
Rock Island Arsenal Museum
I have not yet gone through the referenced catalog, so anyone here can feel free to beat me to it and report back. My thinking was that Russell West may have come into personal possession of the gun as a result of the reorginization of the collection he oversaw in 1918-19. If so, it could be listed in that 1909 catalog.