Unknown tool from armourer chest

[kpl1]

Hello fellow collectors,

This item was in an "armourer chest" that I recently bought.

Does anyone know this piece of equipment? There is clearly a number on it, but I couldn't find it even searching the internet.

Thanks in advance for your answers.

[Rhscott]

It looks like a tool to instal, remove or tighten stock bolts.  I can not get a perspective of how large it is though.

[Tolzer]

WW2 Bofors 40mm shell spanner, used to remove primers.

[kpl1]

Thanks for your responses, it has helped me to search much more specifically. I found an image in a technical manual for the 40mm bofors. It is listed as "wrench safety plunger, spring"