Arisakas are in the 4140 range of steel. Around 38-45 RC, no case on the exterior. I suspect your gunsmith wanted to charge more for a scope mount job. I have done a LOT of arisakas. Probably the closest gun steels I can relate it to would be the MAS 36 and the Savage M99. Even later in the war when the barrels and screw on stuff went to cheaper steels, the receivers had the same recipe, except for the cast experiments. They are so rare I have only ever seen one.
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