Does anyone happen to know what material was used for Bren bolts (7.92mm Inglis ones, specifically) and how deep they were hardened?
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Does anyone happen to know what material was used for Bren bolts (7.92mm Inglis ones, specifically) and how deep they were hardened?
I can only partially answer your question. On one of my .303 bolts I machined off about .015 and it was 'soft' at that depth.