Forgive me, but I’m in a punny mood tonight. The attached pix will show an unusual recoilless casing in the 105mm range. It is the casing on the bottom in the first picture. The top round is a 106mm recoilless and the next casing down is a 105mm recoilless given for size comparison. All dimensions are evident with the scales given. Does anyone have any ideas? Thanks for any help, Bruce.