and likely an early 1940's addition of Howe's "modern Gunsmithing", Vol 1. I'll have to check mine, but I think he describes how to add such features to both Krags and 03.
I keep telling myself I'm done. I have enough, then my heart throbs in a pawn shop and the price is irresistible. If this one needs a new barrel, I may do another USMC A1 clone, and gift to my little brother and start shooting the vintage matches together. He doesn't live far from Camp Perry - and it's been on our todo for a long time. We have USMC service in common, over a decade apart. I suppose the worst case is I pick the best shooter and sell d other.