I would not doubt a bit there may still be a few old jap rifles in rvn being as they did occupy it in ww2 for a few yrs , but like they have said unless they left ammo behind with them who knows if any ever got used but have to say from all i have read those cong were pretty good at adapting a lethal killing device out of not much. So there is a chance a few could have seen use. But have yet to ever see a pic of one during that conflict ever as well.