Please help identify a 2.5 inch rifle launcher cup part 3

[breakeyp]

This 2.5 inch bore diameter launcher cup seems normal but the method of attachment is different. The normal claw mount is missing and a rectangular lug threaded plug is inserted in its place. External AFV smoke projector? A normal cup and claw mount is shown for comparison on the right side.

Attachment 96807

Information

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[Peter Laidler]

External tank grenade or bomb thrower. We gave several of these away that had been used as trials for throwing gas grenades

[mr.e moose]

Looks like the cup that the external Ross launchers had.