8,83 is the land-to-land measurement of the bore.
I notice that the barrel extension seems to have been heated, likely when the barrel was changed. Since this was born an Artillery model, the rear toggle link was also changed to this one, which has the rear sight,
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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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