True, I have yet to find a Mosin with unsafe headspace (I'd hope they check them when imported so if there are any bad ones they are not getting to shooters' hands), but it is possible. I have seen a couple that fail no-go gauges but still pass field. But it depends on a lot of tolerance factors. I saw one guy who bought two Mosins and one failed no-go and the other passed. He swapped the bolt heads and then they both passed.
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