I will defer to Bert, but I believe there are different sized bolt heads available and some work can be done to most bolt heads to assist with headspace on a Mosin.
Such a simple design and very effective. If I had to manufacture 100 million effective battle rifles, I could only use 13 man hours per rifle, and my budget was 15 Rubles per rifle, I wouldn't think real long or hard about which design gets chosen.



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