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An NS (Nickle Steel) marked bolt would be correct for your s/n. Stock is a replacement with the stock pins. Nice rifle, I would only change the bolt.

JA would be FJA for Frank J Atwood inspector. The SA on the butt would be a rebuild stamp. I7 bolt is from 1915 1916 time frame, single heat treated. Stock with FJA and not grasping grooves is a...