CAS mark on No4

[brnom2]

Can someone shed some light on what the CAS mark on a No4 7.62 conversion means please

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[Bindi2]

It is the proof stamp that the rifle passed when it was rebarreled to 7.62 or commonly called at the time the crack test stamp. At Lithgow.

[Maxwell Smart]

I've seen both CAS and CAL stamps; I'm certain that the CAL one is Lithgow, and have read somewhere that Sportco in South Australia did the crack testing as well, which might explain the different mark.