From what I have researched:
Japanese rifles used Japanese Walnut which in some ways is a blanket term which include different Walnuts.
Walnut,Beech and Katsura up to Type 38's.
Walnut on Type 99's.
The original finish applied was with Urishi which is a skin irritant by the way. Towards the end of the war with the Type 99 the wood quality diminshed along with the Urishi finish.
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Dave
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