Need help identifying this WW2 artifact from Japan

My aunt bought a box that has writing on it and I’ve translated it as a retractable gun barrel but I’m not well-versed in weaponry from that period and the kanji is a bit hard to read.

I have an image if anyone can help me out!

https://www.reddit.com/r/japan/comments/xel2h6/need_help_identifying_this_ww2_artifact_from_japan/

2 comments
  1. Try posting the picture to r/translator and see if they can help you out (I’ve seen similar requests to identify old WW2 artifacts, including Japanese weapons, posted there before)

    Edit: Sorry, meant to post r/translator, not r/translation

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