For some reason Savage started to pin the bottoms on only the magazines for the 1912 semi-auto, the early magazines for these were not pinned, also they started to plate the followers in the magazines with pinned on bottoms. I have no good ideas about why they did all this, the plating was probably done to keep down corrosion because you could not longer disassemble the magazine to clean it and semi-autos, especially with some early ammo, could really make a mess of internal part. I have not found any differences in how the magazines function, the 1912 magazines seem to be fully interchangeable with the ones for the 1903. Here are some differences you will find in magazines for the 1912's, since this picture was taken I acquired another variation of the magazine that is pinned different -
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