interesting receiver production in 1940

[RCS]

About a dozen or so of these M1 rifle receivers have surfaced to date, all have an extra wide rib on the left side, all are revision 1 receivers. Most have had the low guide ribs repaired during rebuild and the serial numbers are from the late 30K to early 43K range.

Photos show a 42K receiver with the extra wide rib as manufactured and never having been rebuilt.Attachment 67033Attachment 67034Attachment 67035

first photo shows both a normal production receiver and a extra wide rib production receiver.

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