it seems like the initial opening spring pressure on similiar examples would be interesting to compare - like between a 1906 30 cal with 4.75" bbl versus the 1900 same bbl length
the 1900 shorter coupling link between toogle and the top ears on the 1900 leaf spring versus the 1906 longer link and coil spring hanger hook / bellcrank would seem to have a different geometry to the spring aspect
also 1900 versus 1906 breechblock/toggle would likely have different mass acceleration factor due to 1900 lighter breechblock and heavier toggle
Bill
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