Hello everyone, I was looking for assistance with identification. It was given to me by my father who was in the Air Force when I was a child. He no longer remembers where or who he got it from but always assumed it was the 30x173mm for the GAU-8. I can’t find any markings on it and haven’t seen many with a polished casing, though this could have been done by a third party. I referenced this thread but could not make any connections: viewtopic.php?f=1&t=1255&hilit=GAU8
Let me know if better photographs are required and I’ll setup the DSLR and create a backdrop.