The stock is Mauser wood and steel, but refurbished as well. The Z shape is illusion coming from the gun case. The stock was less well done than the gun. RIA appraisal said the only fault was C/C/U on left side of the chamber being erased a little bit at corner. Comparing "before" and "after" of right side of the gun, there are some other hints. After restoration, the gun finish becomes less balanced.
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