Weirdly, I have a 1910 M1910 with an original stock, and a 1922 M1903 with a broken wrist. I think breaks are more due to "user abuse" than "spindly-ness". I have another 1939 M1903 which also has the original stock.

The broken M1903 stock has been replaced with a model GK stock. It is far more robust/heavy. I fortunately still have the "old, broken" stock, and am very much looking for someone with a replication machine.