Un-numbered K31 bolt sleeve?

[rum_runner]

Found another K-31 1943. All numbers match except the bolt sleeve. It has no markings. What gives?

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[Patrick Chadwick]

The Swiss were pernickety about things like numbering. So no number = was never on an arsenal-completed and accepted rifle = leftover after production ended and spares disposal. An in-service replacement would have had the number applied.

[RC20]

Patrick's explanation is as likely as it gets.

Any entity that required numbers stamps of various kind were always serious about it.

It was a requirement for acceptance.