Both of my 1903A4 rifles have this vertical line (see 1903A4 picture) on the rear, right side of the receiver bridge. I thought the line was stamped on after the 1903A3 rear sight was targeted. (see 1903A3 picture) If that's the case, what's the line doing on a 1903A4 receiver? Could the line on a 1903A4 indicated the rifle failed 1903A4 inspection and was issued as a 1903A3?

Baffeled (again)
Chuck
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