Just a thought...wouldn't the 03 spline or the 03A3 groove for the key have to be indexed in some fashion to assure alignment with the receiver? The groove could be cut after mating the finished barrel with the receiver but I would think a spline would have to be part of the initial barrel machining process.
Cool info Wes, your resources are quite impressive.
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If it's made after 1918...it's a reproduction
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