Maybe someone can steer me in the right direction on a source to determine correct heat lot numbers for post-war SA bolts. Up until last Saturday, the "latest" heat lot I have observed was a "YO2" on 65 series bolt. I was at the CMPicon north store on last Saturday and bought a 5.4M SA field grade. I looked it over and in addition to the nearly new barrel dated 10-54, it looked like it had mostly correct parts on it. I did not look that closely at the bolt, except to see it was a 65 series and that would have been right. ANYWAY... to make a long story a little shorter, the bolt carried a heat lot mark of "Z2", one I had never seen before. Anyone have any info on these? TIA, Ben.
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