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gumpokc,
The difference between high and low numbers: A few M1903 receiver failures were noted pre-WWI and the Army Ordnance Board conducted an investigation. The result was "double heat treatment" of receivers beginning about 287,000 for Rock Island and about 800,000 for Springfield Arsenals. These "High Number" receivers stood up to the military ammo and later both arsenals included nickel-steel receivers into the double heat treatment process. The M1903-A3 receivers of WWII were both nickel steel and double heat treatment process.
Adam
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Adam Helmer
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