This Japanese manufactured (shorter) upper buttplate screw is for the Type 99 Arisaka bolt action rifle in 7.7 caliber and is in good condition exhibiting a brownish gray patina with some rust and light slot wear. (file photo)
Note: Japanese Type 99 Arisaka bolt action rifles with the following arsenals and serial numbers have been observed with this part: 16866 & 21908
Toriimatsu: 40856
