V40 grenade query

[SG500]

The photographs show a regular practice version (for scale) next to a V40 that has a steel tube welded to the back end with 4 spot welds.
The tube is 34mm long and 34mm wide (external diameter) 26m (internal diameter).
The hole for the fuze to screw into is threaded and of the same diameter as the one on the practice version.
It doesn't appear to have any internal frag lines.
As can be seen from the last photo there is a hole in the base.
It is empty and the weight is 145g.

Does anyone know what its for/more info/why/where from/age etc etc please?

Thanks.

Dave.

 

[SG500]

Hi just bumping this thread.
Any ideas anyone please?
Thanks.
Dave.

 

[Browningautorifle]

About 50 years ago we were using V40s here in Canada for a bit under limited conditions until a range accident ended their use. At the time we were told Israel had attempted to trial a rifle grenade launcher for these...unsuccessfully. No surprise there. I wonder if this is something like that?