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Could the problem be with the bolt body and not the receiver?
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It could be. But that's why we always checked using a calibrated GAUGE, inspectors, bolt which was a standard looking bolt that was gauged and calibrated to be EXACTLY to the drawings. It was then hardened and kept in an oily box by the examiner or Out-inspector. He'd use this bolt to ascertain whether it was the rifle body or the bolt that was finished. But to be honest, after trying a new standard off-the-shelf bolt from Ordnance, the die had already been set. Once the body had been identified as the culprit it was the dreaded ZF and return to Ordnance or abroad/in theatre, especially at the large workshops with the hot axe!
Sometimes we would return the cut-off serially numbered butt socket part and certified scrap paperwork to the unit but generally it was chopped at the workshop
