While we are asking about Springfield bits, I would like to know if there is any modern commercial source for things like 03 speed lock kits with one piece firing pins and bolt shrouds with better gas shielding. Springfield Armory made the firing pins in the 1920's but I have never seen one. I have several of these actions, including two that are already rebarreled, but have never finished the projects because of concerns about the action's mechanical features. They are nice to look at, but it seems to me that everything they did to avoid the Mauser patents was a backward step functionally.

My M1922 sure is smooth though! Be careful about the magazines there are at least two different original types: the M1 seems to be different from the later M2 ones. I would have to dig them out and look, but I seem to recall that one is shorter, which might be useful...