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Dear Mr. Anderson,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located two series titled Letters Received, 1813-1897 and Reports of Tests of Ordnance and Proceedings of the Boards Making the Tests, 1864-1905 in the Records of the Office of the Chief of Ordnance (Record Group 156) that may include information about Krag-Jorgensen rifles. For access to these series, please contact the National Archives at Boston (RE-BO) via email at firstname.lastname@example.org.
For possibly drawings of Krag-Jorgensen rifles, please contact the National Archives at College Park - Cartographic (RDSC) via email at email@example.com.
We hope this is helpful. Best of luck with your research!