Heat Lot Codes

[gap]

Thanks guys, the Duff reference is solid. Saw a few earlier posts that agree you cannot accurately date a rifle by the heat lot codes.

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[Maniac]

Thanks guys, the Duff reference is solid. Saw a few earlier posts that agree you cannot accurately date a rifle by the heat lot codes.

I agree that one can't accurately date a rifle by the bolt but the S-11 <> was a predominant heat code for your date range. The Duff reference you mention also agrees with several others in the same date range that he lists in his Guam Garand Monographs collection of data sheets. My 1.561xxx has an S-11 <> bolt.
Hope this helps