Peter,
In another thread you mentioned the French origin of Krag screws. BR in a very old post alluded to the same. What about the threads do you mean? The number size, the thread pitch or the thread form with the rounded crests and roots?

  Curious about that as the 1917 Enfield has the same rounded crest and roots on the threads, which caused me to think it was a British thing.  Krag trigger guard screws have that same 26 TPI on a 1/4 diameter, seems like the Enfield trigger guard screws were 1/4 with 30 TPI pitch.

I just made some screws for flint lock reproductions in 8-32 UNF sizes. The customer bought his own machine to make them but needed some before he got his machine up and running. His machine was compatible so I sent him set up, tooling info, as well as the programs.