This Japanese manufactured rear sight slide without provision for aircraft arms 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 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:
Nagoya Arsenal: 40856
