Ok so after looking closely at it for the first time ever I'm sure I found some, never really looked before but:
A close up of the rusty bolt...
And the symbols on the top. Still don't know what these mean.
Then
Thats the symbol after the serial number. Meaning Koishikawa or Kokura Arsenal, from 1870-1945. I believe the first one because of the serial number.
Koishikawa switched from "B" to "S" barrel proof mark in the late 800,000 serial number range. It has an "S".
and
Carbines with a shallow "00" or "000" stamped in front of the serial number have been removed from service use.
Serial Number
00963813
First two zeros, are smaller.
http://www.radix.net/~bbrown/japanese_markings.html