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Gunsmithing 1903A4

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Private
Minuteman
Aug 31, 2009
4
0
83
Having owned a Remington 03A4 I'm fairly familiar with those, however on Rock Island weapons I'm completely ingnorant.
My questions are as follows(1) were Rock Island weapons part of the 1942 building of the A4 models, or were they former weapons just modified into A4's? (2) What were the Ser.#'s of the last block made? (3) was the receiver ring info. split as on a Remington A4?