4 1/2" bbl. vs. 5 1/2" bbl.
They were also made in forged alloy and cast steel frame variations. I don't know if the latter had different model numbers, but you can easily tell the rarer steel ones by the red and green holes in the safety area, opposed to the raised "F" and "S" of the alloy frames.
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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