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Dear Mr. Ludlam,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series titled Plans of Small Arms, 1918-1940 in the Records of the Office of the Chief of Ordnance (Record Group 156) that may include the drawings you seek. For access to these records, please contact the National Archives at College Park - Cartographic (RDSC) via email at firstname.lastname@example.org.
We also located drawings in these online patent files pertaining to John Pedersen: https://patents.google.com/patent/US1355417; https://patents.google.com/patent/US1355418; https://patents.google.com/patent/US1355419; and https://patents.google.com/patent/US1355420.
We hope this is helpful. Best of luck with your research!
The Springfield Armory National Historic Site and National Historic Landmark, owned and operated by the National Park Service, includes in its archives a collection of John D. Pedersen Blueprints. The catalog does not specific which specific devices or weapons are represented by these records.
Also, blueprints are mentioned in the the catalog descriptions for the record series General Correspondence, 1916 - 1925 and Various Records , 1917 - 1927, both created by the Springfield Armory. It is not clear from the catalog descriptions which weapons and devices discussed or represented in the records. Both of these series and many of the other Springfield Armory records are at the National Archives at Boston.