This Japanese manufactured fourth variation complete bolt assembly with the straight bolt handle, cylinder shaped knob, .416" long extractor and plain (uncheckered) safety is for the late (last ditch) Type 99 Arisaka bolt action rifle in 7.7 caliber and is in good condition exhibiting a brownish gray patina with some rust specks and light wear. (file photo)

Note: Japanese Type 99 Arisaka bolt action rifles with the following arsenals and / or serial numbers have been observed with this part:

Toriimatsu: 40856