Jap Training Rifle Marking

Hello all,

This is on the training rifle I just acquired
Could someone tell me what this symbol means?
[url=https://imgur.com/LNKIZda][img]
Thank you

Gil

https://www.milsurps.com/images/impo.../f65eem1-1.jpg

Here ya go guys

https://imgur.com/a/gxPtA
https://www.milsurps.com/images/impo.../hGlWjfa-1.jpg
https://www.milsurps.com/images/impo.../RwxYIra-1.jpg
https://www.milsurps.com/images/impo.../i3lUcjG-1.jpg

https://www.milsurps.com/images/impo.../AeOyOIY-1.jpg

---------- Post added at 03:48 PM ---------- Previous post was at 03:39 PM ----------

Here ya go guys

https://imgur.com/a/gxPtA
https://i.imgur.com/hGlWjfa.jpg
https://i.imgur.com/RwxYIra.jpg
https://i.imgur.com/i3lUcjG.jpg