Is this the #71 hold open on the #72 gun mentioned in the other forum? It might be an assembly mistake, or stamping mistake. No way to know. If in its collector stage, someone had bothered installing a "correct" S marked part on it, why didn't he number it to #72 to make it matching? Surely this installation happened in its tool's stage. There are people who could weld up the 1, and put a 2 on top of that without affecting that tiny neighboring "S" and "7", but I would suggest leaving it as is.
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